Welcome to JUB!
I wouldn't try to read too much psychology into what you said.
You specify that you are straight, and do not desire contact with another guy, but images of soft cocks turn you on and you masturbate to, and exchange photos with other guys.
To me, it just sounds like you are a man who knows what his sexual needs are.
You like contact with women, but don't mind getting off seeing other guys.
You will see A LOT of penis at this site! All types and sizes, too!
You are welcome to post all you want (but know that our audience is quite varied), and to enjoy the photos posted here.
We have many JUB members who identify themselves as straight,gay, or someplace in-between, but still enjoy the site.
If you will not be offended by my comment, your cock is beautiful!
I hope that you will share more photos with us as your comfort level allows!
Again, welcome!