In theory, there are three different ways to "ban sex". The game has issue options which imply all three of them, but I do not believe it actually tracks the difference.
1. Make sex illegal, but don't do anything to directly prevent it, leading to, as one effect line puts it, "underground copulation clubs" springing up.
2. Sterilize all your citizens, making reproductive sex impossible (this is effectively banning sex in biological terms), but in a way that doesn't remove their sex drive so that they can still have non-reproductive sex, which you don't really care about anymore at this point.
3. Neuter all your citizens in a way that largely removes their sex drive (castration for males and oophorectomy for females).
(You could also do both 1 and 2 at the same time, but I see little reason why anyone would do that but not go all the way to 3.)
#123 5 wants to "sterilize everybody", implying method 2 (although it could be interpreted as 3 if taken loosely), instead growing people in vats.
#168 2 advocates celibacy and results in "people have to sneak out of the country in order to have sex", suggesting method 1. Although the purpose here is to prevent STDs (and no alternative method of reproduction is advocated), so one might realistically expect limitations like this only applying to unmarried people, no such thing is ever mentioned in the text.
#358 4/5 wants newborns "neutered", implying method 3 (although it could be interpreted as 2 if taken loosely), but does not say how children will be produced instead (possibly vats, but possibly implantation of test tube babies into people's wombs).
#364 3 bans sex, while advocating artificial insemination as an alternative (making it clear that people's sex organs are still biologically functional), and therefore explicitly uses method 1.
#486 5 creates "asexual grunts", implying method 3, with soldiers being grown in vats instead. Apparently it is currently coded as also doing this to the rest of your populace, even though that outcome isn't clear from the option text.
Additionally, these may be done to only certain classes of people, such as those who fail their parenting licenses (#300 1, using method 3) or convicted sex offenders (#075 1, using method 3).
#279 is a reversal for vats. I do not believe there is currently a reversal for mandatory artificial insemination or for neutering of unfit parents. (Shouldn't people who fail the test be allowed to study up and retake it next year?)
