1. Cumflation is a Kink.
2. Not right now.
3. Holding Hands with Rinny to start it.
1. Which Device?
2. Yes it does have that Problem.
Cumflation requires that shrine to be turned on, along with male partners, and your character needs to have a vagina (penis optional).
With all three of these things, go to the upper floors of the science tower, encounter a corrupted scientist, and lose.
Note also that this is the only scene in the game where player pregnancy chance is 100% if you have that shrine turned on. Even without a pill.