I don't know if there is a thresh hold they have to be at to masturbate or if they have to be at 100 lust, but like I've said, I've had a couple nekos getting up to the 75-80 point before just running off. I thought if I place my character in front of them so they can't run away they might stay around but I guess when it's their time to leave they leave, weather they walk off the side of the map or teleport away lol.
Thanks for the Response! I eagerly look forward to what come of this game!