However, your body has changed and you will have to live up to the expectations of that gender. If you can imagine that for just an instant, you can understand what it is like to transsexual. Transsexualism then is simply have the internal gender identity of one sex and the body of another. Put another way, it's being a woman's mind trapped inside a male body or a man trapped in a female body. Sexual orientation and gender identity are separate issues.
Most transsexuals consider themselves to be heterosexual members of the opposite sex.
Many of us are celibate. Most of us are very conservative in sexual matters. Some male to female transsexuals will become lesbians, however, that is unrelated to the gender dysphoria. It does not imply a specific type or prevalence of sexual activity. All that is happening is that the person you know is leaving one gender to join the other.