I'm guessing if you get the naked tab in the character profile that's the good ending? I mean we got married so yes? lol, but we only seemed to have sex after we got engaged.
Yep; that's correct.
Jake is a little more shy about sex, but if you've unlocked his good ending, there's some bonus scenes you can play from his character profile.
wait bonus scenes from the profile... how do you do that?
The top "tab" in his character profile, if you've achieved his good ending.