As someone who's lurked for many years on this website, I want to post about a topic I have not seen specifically discussed. I am interested to know if I am alone in this situation, or if there are other men like me that are struggling. It is a long read, but it concerns my developing obsession with my father-in-law's dirty underwear...
First, a little about me. I'm a married gay man in his 30s. I have a fetish for sniffing dirty underwear, especially when there are skid marks. The skids can be light, or really heavy...I have always loved the sight and smell of skiddy undies. Tighty whities with brown streaks are my favorite. I know many guys are grossed out by skids, but I fantasize about them every single day. I'm always checking out men's asses and wondering what kind of undies they wear, and how dirty and smelly they are. I am definitely obsessed with my skid marked underwear fetish. I'm not sure exactly how I got this fetish...just always loved the smell of ripe hairy ass when I started messing around with guys when I was younger. One of my first boyfriends wouldn't shower very often, and his undies were kind of a mess, so maybe that started the nasty ball rolling. I'm fairly clean myself and don't have a job where I get dirty. But I've always been attracted to blue collar men, like construction workers, who get very dirty, sweaty, and smelly. I also love men who are bigger, like 250 to 300 lbs, have facial hair, and are very hairy...especially in the ass. I'm sure I don't have to spell out why...
My hubby is very handsome. He is a big, hairy guy with average hygiene. Some days he's clean, but when I'm lucky, there are some days when he's stanky and I love it. He knows his smell turns me on, but for some reason, I have never gone into detail with him about my love for dirty underwear. I just feel like he would think it was silly, and it has never been a thing that's turned him on. Things are fine with me and hubby, but my problem is with his dad...
My father-in-law is a big hairy man with a southern accent. He is attractive, much like hubby, but grayer and older, obviously. He has gray facial hair and glasses and looks like your average country daddy. He's a super nice guy and is very blue collar. He's retired but loves working outside on his house or on cars. He and I have an okay relationship, but I'm more brains and he's more brawn, so we don't really have a lot in common to talk about.
One of the first times that hubby took me over to his parents' house, we were sitting around chatting, and I noticed that I could see his dad's underwear up his denim shorts because his legs were crossed. I could tell they were white boxer briefs because of the white cotton sticking out of the leg holes. I thought, Man! I hope I get an opportunity to check out his drawers someday. And then, soon after, I found out where their dirty laundry basket was kept. Right on top was a pair of white Fruit of the Loom boxerbriefs, and I could not resist the opportunity to inspect them. I turned them inside-out and noticed some long permanent streaks in the seat that had not washed out during prior washings. I was surprised and turned on that he was such a bad skidder. They looked pretty threadbare in the seat too, like his undies were very old.
Over the next year or two, I would often excuse myself and find time to rummage through the laundry basket. Some days there were decent skids, others nothing. But about every 4 out of 5 pairs of undies had decent permanent streaks in back. I did not get too many lucky "fresh" stain sightings (or sniffings

) but it was very thrilling and exciting to inspect those boxerbriefs. But I never did more than inspect and take a few sniffs of those stinky white FTLs. I would put the undies right back where I found them. I had a few close calls when the door would open and someone would come in, but to this day, I have never gotten caught.
I can remember one morning after we spent the night at their house when my obsession escalated. Father-in-law needed our help with a project that day. Since he wanted to get an early start, I took notice that he had not showered that morning, and his last shower was the morning before. He wore sweatpants that day even though it was hot in the house. He was moving boxes in the garage and was getting really sweaty. The whole back of his blue sweats were soaked and I could see the waistband of his white undies showing when he would lift his shirt to wipe his face. He also has a habit of picking wedgies, which he was doing a lot of that day because he was sweating so bad. I thought, I HAVE to get a hold of those undies, no matter what. That night around 7 PM he took a shower. After his shower, everyone went to the other end of the house, so I went to the basket and pulled the still-warm whities off the top of the pile. I went to the bathroom with them and inspected them. Finally!! There were about four to five nice skids going all the way up the back for the entire length of his crack. I sniffed on those babies for a good five minutes or so. They had that sweet, musky smell that I crave when I put skid marks to my nose. I even took pics of those skidded undies on my phone to use for later J/O sessions. I then dumped them back in the basket.
For better or worse, I think that really ramped up my obsession with him and his undies. Since then, any time I see him working during the summer and getting really sweaty, I instantly pre-cum my undies to the point they're sopping wet. I notice when he picks his ass and sniffs his finger like the straight man pig that he is. There was even a time that he made a comment to me in a store that he would never own a pair of white dress pants because "they'd show my skidders too bad." A grown man talking so openly about his skid marks is so fucking hot to me.
It has gotten to the point that I even made sure to buy the exact size and style of his underwear and keep a clean pair with me in my pocket, so that I can swap them for his dirty pair and bring them home, if I'm lucky enough to get them. Most of the time, I have been able to, and I have quite a collection of his stinky shorts. But he has begun altering the color and brand of his undies, so I have had to be very careful if I want to keep up this taboo act.
I know what I'm doing is probably wrong...but my fetish has always been there, and the access to a handsome hairy man's dirty undies is too much for me to pass up. I would not want to steal his undies so I always replace them with a pair...but that is probably more because I am afraid of getting caught. Some of the pairs I have nabbed have been downright filthy, and I love it.
Has anyone even remotely experienced any urges like this? I have more experiences if anyone is interested, but I think that is enough for now.