This is the most insane premise for a lewd manga ever. It amuses me.
What doesn't amuse me is that one of the glasses girls took hers off and another got smacked in the back of the head. I mean sure they're gold-diggers, but that ain't cool. Inferior gyaru should learn her place.
Not sure why protagonist is so bothered by losing a few years off his life though. If he maybe just holds back and only jerks off a few times a year, he'll be set for life at a minor cost.