If he said he's not, I suppose he's not.
I'm sure he could easily find a gay or non gay even, to do him in the back door.
But he is asking a female to do it.
I think of being gay as having a relationship with the same sex.
For example, I could rub taco's with a girl every now and then but I'm not gay.
I suppose because I do not want to have a monogamous relationship with her.
It's a pretty backwards debate as it is NOT the sexual activity that makes one gay but rather who they prefer to perform that activity with.
There is absolutely no difference between a woman sticking a tongue/finger up his butt to enhance the experience or using a toy.
This (Bend Over BF) activity is actually extremely common with many heterosexual couples these days and is termed "Pegging". Look it up.
I think the original poster on the Houston thread is close minded and not very discreet. Those are both hugely unattractive qualities in my book.
I don't care how physically attractive a women might be... if she's close minded, judgmental or likes to discuss her client's proclivities here then I have no desire to see her.