Well, you can ask your therapist for everything. Now, whether that can be done or not... I have no idea.What if a person has pedophilic obsessions and wishes to alter it through therapy? Would it be permitted?
I don't think its possible to change your sexual beliefs though or it would be a widespread practice as many people are ashamed of them... what is possible is to supress them.
What do you mean?Would certain sexual deviations be preferred over others?