For me, function for sex is not important. I can use something else when I get my freak on :'P. For me, aesthetics and stp function are more important. My issue is that I'm a nudist. Once I get issues like my chest fixed, I'd like to be able to actually get nude XP. I'd basically like something where people don't look at my crotch and think "lol wut?" It doesn't have to be perfect since no guy has the perfect penis. I don't mind if it's a little funny looking, I'd actually prefer it. It would just give it character :'D. While I'd prefer foreskin (since my younger brother is also uncircumcised), it's not 100% necessary. I'll just tell people it was from my kosher days :'P.
Now for STP. I'll be willing to learn with whatever you put on there, I just need it to be anti-microbial. I am so prone to infections, it's not funny @_@. I can't tell you how many times my bladder has become a bacteria orgie ;_;. One time I had an infection for so long because I was getting so use to them, it spread to my left kidney! D: I regret not taking a picture showing how swollen that bastard got @_@. So yeah, as long as it's less likely to give me an infection I'm good with whatever is used :'D.