Well, wolf repellent stops both night and day encounter, I think. Since low wolf attitude means you've beat them a lot, I like to think that they got scared of fighting you in the day.
About the male/female rate, yeah, I misunderstood your question. So I checked again and orientation do plays a role. So, yeah, Straight male/Gay female gets female bandit more often and the chance keeps increasing the more you have sex with females (any female, not just the bandit)
Also, boning the bandits aren't available yet.