The presents that explode can and will launch you out of bounds.
Also, so many jumps being instant-kills is annoying, and on the level that introduces the collapsing floor, there's no way to reset it without killing yourself, so you can get part way through the level and need to jump off a cliff because an area has become impassable.
As for the sex content... the animations aren't great but more than that there's just not enough of it.
it'd be better of some of the enemies had grapple attacks or something, so H-content wasn't purely relegated to 'you failed' scenes