self-made, I know what you mean about the musicals...they've never been of interest to me. And now I don't mind.
I love Broadway, well...I love theatre. There is such a special energy in those places. And I try to go to to a show every time I'm in NYC. If I'm in Boston, it's Opera House, any other city - their repertoire theatre. It's my kind of thing. :)
As for Mamma Mia! - the whole plot doesn't make much sense, since it was build around ABBA songs, but who cares...it's a very upbeat show, and that's what I like about it. Yes, there was some "sexual humor", it's not that explicit though, the movie is PG-13.
I do realize that tastes differ though. :)