As someone who PVRd, I'd still recommend joining to anyone, with the following advice:
Join young and single.
Enjoy it while it lasts.
Keep a view towards civvie street.
As soon as you get married, start planning to leave.
If single and no longer having fun, start planning to leave.
If you are planning a family, get out immediately!
The RAF life (and that of the other Services) is not compatible with family life in modern society. It was more compatible 20 years ago, when family life was different - this is a reflection on society. The overstretch and cutbacks make the situation worse.