Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
If you were 29 and deciding on a lifelong partner who is a woman, that could be a different situation where she'd have to accept your choice.
It's hard enough for some parents to know their children as sexually active and at times, it's more of a don't ask, don't tell scenario.