The Problem Of Preference - A Question For Solipsists

Why do I like pleasure and not pain?
Can my liking of pleasure originate in my senses?
No. I feel pleasure through my senses but that doesn't make me like it.
Liking is a mental state.
The pleasurability of pleasure is a mental state.                                                                         Furthermore it is a mental state that is automatic and instinctive as if it has been programmed into my mind. But why? Why is my mind programmed with that mental state of liking, of pleasure with certain sensations and not others?

To Descartes, I would ask, why would my mind be programmed to instinctively prefer one illusion to another?
One explanation that I thought of is that my mind is programmed to suit my senses. My mind is programmed to like pleasure and not pain almost as if those sensations existed first and my mind was designed/evolved to suit them.
That would certainly make sense if my mind was designed/evolved in conjunction with my senses to exist in a world where things that cause pleasure and pain exist.
You might say to me. What about masochists? - But if this is a solipsist question I can only talk about what I experience and I am not a masochist. I don't even know for certain if masochists really exist. All I know is that I, personally, like pleasure and not pain.

Also this can be extended to other preferences. Since my sexual desires are linked to what gives me pleasure why are my desires heterosexual? Why do attractive women give me more pleasure than handsome men? Since it is equally possible for me to derive pleasure through homosexuality or heterosexuality why is my mind programmed to find heterosexuality pleasurable and not homosexuality?