Hmm...can't seem to get the last event for the 4th 'bride' to trigger. Max favorability and cleared the game, but still won't fire.
The MC uses 'Glove' weapons that can only be found in stores on adventures. He can also use the nightstick from police and the zen blade from the temple.
3 main heroines (the brides) can't seem to get pregnant. There just aren't any sex scenes outside the favorability events and end game marriage event.
Lilli the bank girl can get pregnant if you attack her enough times. Best way to force it (pun intended...) is after you build the bank as she stays in the bank even after attacked. Otherwise she runs away and only returns after you adventure a few times (IE: Time passes)
Thief girl is a scam. She will ALWAYS win and there are no scenes tied to her. Its hinted that you can progressively unlock a scene by stripping her, but she will always win so its impossible.
It is WELL worth it to invent in the roaming professor. He will return several adventures later with a continuous attack ring that allows you to hit twice a turn and speed up combat a lot.
Fat blue man is also important as he will raise your max level every time you donate.
The other female NPCs are the soapland employees. There are 4 stores in total you can find in the dungeon. You can impregnate all the employees, but its entirely random. When you pick a girl she may offer to let you do it raw for extra cash and that's how you trigger it. Otherwise it's just a finger exercise with sprite work and a picture of a face.