When you say that armor doesn't work, that you don't see it equipped in your screen, or that the effects of it aren't obvious?
For the sex scenes, do you mean that the vaginal sex options are disabled? (You don't need to fight them to have sex with them - are you referring to the enemies after you defeat them in battle? If you can post a screenshot of the sex scenes where you're unable to do that, I would appreciate it a lot!)