Normally and ideally for ME personally, I prefer a smaller to average size cut cock (curve irrelevant) and CLEAN, but that is not an absolute! I enjoyed a 22-month long relationship with a hunk that had a 7" uncut beauty (that I loved to play with)!!! I've also enjoyed sucking a few (exactly 3) cocks that were pissy smelling and tasting, but they were nervous, first-time "straight" boys that were probably scared pissless about jumping over the proverbial fence; I followed up with 2 of them, and only one did I have to take a wash cloth to before I continued.
Not to be a prude, as I know it's just a personal preference, but I hate myself for hating non-retractable uncut cock; they carry an unwashable lifetime of cheese and man-funk that I cannot appreciate, despite the man's otherwise physical perfection, lol, and gawd knows that I've tried!!! And HEY!!! I was with one guy for a month in Florida that was naturally hairy, but shaved his pits and pubes religiously, which I hated, but understood, as even showering thrice daily, poor HANDSOME guy (with a beautiful cut cock) just had overwhelming natural pheromones ... lol, he stunk! Lol ... he even saved up and bought himself electrolysis hair removal for his pits in an effort to rid himself of their oozing body odor. It only helped minimally, but since we weren't nudists, commando or not, his crotch was always covered and sweated too!
Lol ... 7 years ago, and I still jack to Mr. Lynn's nudes and vividly remember his taste and smell!!! Thankfully, he met and married an Armenian woman that was here on an education visa that truly appreciates his pheromones ... or at least, I hope she does. 4 years and 2 kids later, they are still happily married with Lynn nostalgically remembering our time together, but supposedly not wishing to renew. As with all of my ex's (even most of the nervous 1st and one-timers), I remain friends with them. "What is done in Fuck Club, STAYS in Fuck Club."