Tripple finish is in the pre-pregnancy minigame, or at least it used to be.
(HINT: you need to give the poor guy a bit of time to "save up" first)
I don't know which one is "perfect seed"... there doesn't seem to be any such name.
But "seed of destiny" simply requires to reach end of pregnancy with 100% growth progress (eat well, and if you miss a day get the pill that fixes it)