hand soap can't be healthy for you to use man. just sayin i know if i was going to have anal sex i'd use a shit ton of spit before i let a guy put soap on his dick and stick it in my ass.
Damn kid, you really could have hurt yourself. You should have gone to the emergency room. But, if I was in your shoes, being just 17 and having my first sex with a guy, I would have toughed it out like you did and hope for the best, also. The lesson you need to take away from the experience is you lack some basic knowledge about safe sex and suffer from the same problem most of us all do (even guys in their 40s and 50s); when horny, we often settle for less than optimum places/conditions to have sex. Don't worry about the erection thing. That is normal when you are in an unusual situation. It will eventually sort itself out. If you still have any physical side effects from the soap, get to a doctor and fess up. Side effects lasting this long could be serious. As far as being gay, bi, or straight, it is too early to tell. It may take a few more years of experimenting before you begin to understand just what label fits you best. Your primary concern needs to be safety. Go to the Planned Parenthood website and learn about all the nasty diseases you can get from unprotected sex. Then buy rubbers by the case and lube by the gallon if you have to so you ALWAYS have them. Never, ever give or receive anal sex without a condom. No matter what anyone says. Keep in mind that one out of every three people with an STD (sexually transmitted disease) will lie and tell you they don't have any just because they want to have sex with you!!! This fact comes from both the Mayo Clinic and Planned Parenthood. Watch out for guys that are much older than you. Your instincts when cruising as a ladyboy were telling you something. There are a ton of older guys out there that would love to take advantage of a 17 year old. Getting your ass ripped open in a gang bang is no picnic. Stick with those close to your own age.
Be thankful you didn't get granulars of sand up in there. Because if you think liquid soap is a bad sensation, try tiny shards of glass and rock up in there. I'm a top, so it's never happened to me, but I've heard some horror stories... My advice, sex & the beach don't mix.
Other people said smart things about unprotected sex, using soap as lube (never again!) and the risks when cruising as a ladyboy. So let me make a few remarks about the thing I quoted. I'm a bisexual male and I watch a lot of gay porn. And I noticed that most 'bottoms' loose their boner when being fucked. I have very little experience with penatration (both bottom and top) but the few times I was penetrated I didn't have an erection either, although I was horny as hell. So I don't think you should worry about it, it seems a natural thing. Maybe it has to do with the stimuation of the prostate, I don't know. About identity: do you really consider it important to stick a label to your sexuality? You're still very young, with little experience and a lot of phantasies. Don't worry whether you're heterosexual, homosexual, bisexual: it's obvious that you're sexual 'tout court'. Enjoy that fact, explore you're sexuality, don't let anyone push your limits if you're not ready. Be sexual!
Others who have posted here have said a lot about safe sex and using soap as a lube which is a bad idea. So, I will address the question of identity. From the time I was first sexually aware I have had fantasies about having sex with guys. Now I have never really been into anal sex, but I had a friend with which we would engage in mutual masturbation. In fact my very first sexual experience was homosexual. However, I do not consider myself a homosexual, but bi-sexual. Why? Because when I go out people watching I find that the females far more attractive than males. When it come to girls my taste is very eclectic. I like 'em short, tall, skinny, chubby, short hair, long hair. They all turn me on. When it comes to guys I only find pretty boys attractive. The fact is the only homosexual experiences I have had were with guys that I had been friends with for at least 6 months. They were otherwise straight guys that I knew were sexually active and permissive. People who are into sex like to talk about sex. At some point in a conversation someone would talk about being horny. I would make an off hand commit about being able to handle the problem ourselves. If the reaction was positive, that was all it would take. I don't know if all this rambling is of any help to you. Basically I would say if you find girls sexually arousing but not guys, your heterosexual. If you find guys sexually arousing but girls do nothing for you then your homosexual. If you get aroused over both sexes your bi-sexual. This is of course an over simplification of the issue.
Omg, how could you have used soap? Soap on eyes or mouth is a bad idea, what made you think the anus was a good one? XD Anyways, I do think you are bisexual. The limp cock thing happens to me all the time, even when I play with my ass mostly because my head is elsewhere; the top one.