The guides:The exact mechanics still elude me, so a guide would be nice.
PS. How do I see my stats? All I see are those two bars at the top left of the screen--and, also, what do those mean exactly?
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The two bars are:
the red one - Lust (it limits your ability to have sex; since there used to be a way to replenish Lust, but in the later versions it's gone, I strongly recommend to use cheat code "infinite lust" as soon as you load the game);
the blue one - Spirit (have sex with any NPC in town to replenish it).
You can transform your character, turning it to various nephelyms (of those species you've already caught). To be able to do it, visit Leylanna in the temple, talk to her and complete the quest she gives. Turn Spirit Form on/off by pressing Q.
Having sex while in a Spirit Form allows you to breed your own offsprings of different kinds.