Look at it from the girls perspective: Women have needs too!
There is a reason for the 6 girl harem maximum, you have to boink them at least once a week to keep them satisfied, you can bang your favorite chick twice a week if you like
If you're tired of seeing the sex scenes, just fast forward in them, but for the love of pootang don't forget to invite girls to that bedroom, because if them aliens don't get their fresh porn they will explode the planet!!
Should a girl feel neglected and leave your harem, you can always try to invite her back.
Increasing the payment would be a bad idea.. some players dislike grinding for cash when they can grind for sexy scenes and stats instead