I cant buy that!
Taking it up the arse from a bloke = Gay
Taking it up the arse from a girl = Bisexual
How is it bi-sexual if you'd only let a girl do it? Your sexuality, surely, is only defined by the sexes that you are attracted to and not what you you like to experience sexually?
As an aside, isn't the male g-spot meant to be located somewhere up the wrong 'un?
There is a massive difference between having your prostate massaged and being shagged up the arse by a woman with a 10" strap-on cock!!!
It's wrong to say its gay as im mature enough to realise it goes on between straight couples, i just personally would'nt be interested in any pegging. Each to there own.