after 18:00 in the basement you can run into him having sex with Blake. During the Bareshade expansion he will also have sex with 3 other guys, but those events aren't repeatable..
Edit: just saw the reply above me, whoops..
Both actually, you will visit Bernard when starting the more houses part, right? Bottom Logan will get angry at a person and drag him to a secure place, you can watch him and join him as well.
and during the better defensives when you recruit people for the watchtower, Logan was willingful to help train them because you knew he was already planning how to have sex with them, unfortunately we never got to see that..
You mean with that drunk guy and the other one who likes to be called "daddy", right? I can't remember their names. Would have loved to see that lol, even a repeatable one like whenever you visit the watchtower guards you'd see BLogan with the drunk guard or the "daddy" guard.
For some reason, seeing BLogan like this unlocked a voyeur part of me I didn't know I had lol.