If you are making decisions about what you will do in bed based on advice given by strangers over the internet, then you may have problems, but I doubt homosexuality is one of them.
Lets me real clear here guys.  Sexual things you do with a person of the opposite sex regardless of what those things are, is an act of heterosexuality.  Things you do with a person of the same sex, that are of a sexual nature, are by definition homosexual.  
Now I don't care if anyone reading this, is straight, gay, bi, whatever, the older I get, the more I realize that whatever makes people happy is great.  More power to you.  
But guys freaking out over a girl doing something to their butt, and it somehow turning you gay, or seeming to be gay, or whatever, is a bit out there.  I don't think you can turn a person gay, or straight for that matter, any more than you can turn a housecat into a poodle.  
Just my 2 cents.
B.