Accidently had a mild sexual encounter with an older man?

I am 21 years old and I go to the gym alot! I have a real thin toned body, Two nights ago I went into the steam room, and a much older guy prolly in his late 50's followed me in there. He struck up a conversation with me which was normal, then he started complimenting over and over about my body. It actually got to be a little flattering. After a little while he asked if he could just run his hands down my abs, well after a little coercing I finally agreed to let him. So I put my arms up and he started slowly rubbing up and down by abs and back, arms, shoulders, and I hate to say it, but I really liked it alot. He just seemed like he was in absolute heaven. I noticed that he was getting an erection as well, but it didnt even bother me. I am real nervous now. I have nothing against gay people, I just dont want to be that. Somebody please help me.