Not only do pilots hook up with the attendants but also passengers they meet on the flights, random women at bars hotels etc. Same goes for flight attendants, quite a lot of whom have multiple guys they see in different places.

Do flight attendants pick their schedule?

They can design their schedule: Senior flight attendants often can choose or create their schedules. Though they may not get every request, senior flight attendants have scheduling priority and flexibility, and some may choose to work the same line to maintain a routine.