...or participate.
@42069Nice: iDK how long the two of you 've been together but if it is a good and close relationship it may be worth working on it. In any case, if you love your girlfriend you won't do anything that will harm her or let her be unhappy, unsatisfied or frustrated. Even if that means that you will have to break up with her.
(Even though i don't say that that will be the necessary consequence.)
What's her age? As men we have a responsibility for our women. Trying to extend a relationship while you already know it is not meant to last is a very bad thing to do and selfish. Most people imagine themselves with a loving partner on their side, and, more importantly, with chi!dren one day. A woman's time to achieve that is more limited than a man's because of biological reasons. Stealing important life-time from her and perhaps making impossible that she will have the chance of leading the life she desires is very bad actually.
But as i said, it doesn't necessarily mean the two of you will have to split up. i know of couples who manage to have a healthy relationship and a good life together, even though the husband or boyfriend leans more toward men sexually. But, like
@DarkPrince88 and others have said:
Honesty is the key! And finding an arrangement that works for both of you. Good luck!