Not bad little game, but as other have said, wish there was a bit more corruption that happens and bad stuff that can happen.
For those that don't know how to use dildos, didn't know either, apparently it only happens when you take a shower (completed the game, saw it in gallery).
3D sex scenes unlock after a while.
To get all unlocked as fast as possible use cheat engine, cheat either the main level or what I did as I wasn't sure if it wouldn't break the game, cheat the points you earn everyday, set it to 300 and give yourself infite money, don't bother with people in the city, just do the bunny/crab mini game in the hostess club, 2 a day, gives you 2 levels a day, so you can be at max level (50) in about 25 days.
As for encounters, you can do service (no penetration) in the hostess club, in the city you get grope/bj encouters at first and later sex (all 2D), there is single encounter (grope) that can happen at the parking lot (you may have to skip time few times by sitting on the bench so the guy shows up, has hearts above his head) and for sex you first get slots mini game in the brothel, then regular encounters where you select clients and select position (2D) and later you get 3D option (the 3rd one).
To go full screen or change image size, it says how to do so in the main menu.
Beware game may frezee when doing the encounters in the city, so save before you do one (or don't bother with them).
Good for 30-60 minutes, after that little to no replay value and not much happens after level 50, just endless waiting for the pregnancy (which isn't that great anyway, birth scene is included but it's 2D, can be viewed in the galler).
X-Ray is really basic, no condom breaking, no faulty birth control of any other kind, no forced sex/rape, clothing doesn't seem to improve the stats I think (at least didn't notice anythign new when walking outside in slutty clothing as opposed to regular one), no bulges, no cum inflation.