Trying to find the title of movie where a "lover boy" is killed by three woman in a hottub and then he's reincarnated as a woman as punishment for his womanizing.

There were a few movies made like this. Can't remember the hot tub scene but it might have been in Switch. Are you talking about an oldie or something a bit more current. Here are two that come to mind immediately.

Goodbye Charlie (1964)

Switch (1991)

Let me know if these aren't it and if not, if there is any other details you can remember. I am sure I am missing a couple of movies with this theme, but I will track them down for you. :)