What do you Classify this Person?

I just had a talk with my little bro's friend who just came back from USA. One of the curious topics we talked about is when he told me about one of his most colorful teachers at his University.

Before I go into a little more detail on what it was about, let me recap a few terms.

First of all, if a person is a homosexual, and the guy likes a guy, we call that a gay. If a person is a homosexual and the gal likes the gal, we consider that to be lesbian. A heterosexual is the normal classification by most people's classification. We consider people who like both sexes to be bisexual. Another type of classification that is in rage at the moment is what we call metrosexual which are males with a strong aesthetic sense who spends a great deal of time and money on his appearance and lifestyle. Other type of sexual classification are people who are transexual. These people undergo sex change operation so that they can feel more secure by being the same sex physically as they are mentally - by the usage of surgery to correct a few "physical organs". This though caused a few problems as its hard to classify them as either a he or a she, in which I'll leave this discussion for later. The last variation of classification of sexual orientation that I want to discuss are what people call "she-male" or people who have both Male/Female characteristics. That means most of these "she-males" are technically male, but have some sex change operation that are usually limited to the addition of breast to the male body but retaining the bottom part. These group of people are usually bisexual in nature, and are considered a rather strange breed of sexually confused people.

Anyway, I'm not going to debate about the moral issues of being sexually different, but I just have a hard time keeping up with the classification system with so many types of people coming out of the closet. Anyone with suggestions with this?

What happens if a man feels he is a woman trapped in male body and decides to go for a sex change operation. After the operation, the new person felt comfortable as a she. However after many failed dates with males, she suddenly feels the urge for a female partner not a male partner and then goes off with a female partner.

Is it a transexual that decided to be lesbian? Or do we consider it to be a heterosexual who happen one of the partner to be transexual? Hmm... What do we consider this type of people to be? Or is there a new term for the classification of these people? Just curious...