No we don't. I know sevarl homosexuals that are very well adapted. In fact I know none who are maladapted. I'll admit it's a small sample. Your first comment about mental illness reveals something weird about your position. Then you seemed to catch yourself.
Be careful on the homosexual sex stuu. You may know, if not from personal experience, that many heterosexuals engage in the same sexual positions and techniques as do homosexuals. There just seems to be one more option for many of us.
You don't know any. A properly adapted person is attracted to members of the opposite sex. That's the way their bodies are designed and that's how they are if properly adapted.
Supposed I really liked to eat with my feet (although I have fully functioning hands). That would be a maladaptation because I am made to do such intracate work with my hands. I might figure out how to do it all with my feet (I saw a man who was born armless on TV once who was incredible) but it would still be a maladaptation. I might force my friends and restaurants to all put up with my strange behavior, but it would still be a maladaptation.
It would also be easy to correct since I could simply use my functional hands as intended.
Shalom.
If they are trying to use heterosexual physiology for homosexual purposes then they are maladapted.