No really, Princess Celestia has a lot of sex. Really. Cadance's claims to the contrary are unfounded, wholly false, and her concern over the matter is entirely misplaced. There is absolutely no reason to continue discussing the matter.
Sonata has a tooth ache. Adagio and Aria don't want to deal with it. Sunset Shimmer gets involved. Applejack is there. It's gonna be one of those days.
Love Tap has a reputation for being excellent at taking care of children. Twilight needs somepony to help look after the sirens. These two things really shouldn't have any connection, but desperate times call for desperate measures.