In general vserious accessories will be eventually added to the game, not sure about pubic hair (maybe), as for "tights tearing" part I don't think dev will add that, sounds like hell lot of work to animate the sprites
As for pregnancy - forget it - think about it, everything in the game happens in mere 2 weeks, even if you were able to impregnate Yuna, you wouldn't see any effects, as it's way too early for the belly growth
There are plans however, to add pregnancy as one of the game endings