I'm just going to start out by saying I love these musicals dearly and have no shame when it comes to singing these songs out loud, in public places, in costume, without explanation, and to the horror of my more modest friends.
That having been said, as I've learned the hard way, sometimes context is a good thing.
9. "A Hymn to Him" (My Fair Lady, 1956)
8. "Everybody Ought to Have a Maid" (A Funny Thing Happened On the Way to the Forum, 1962)
7. "Brush Up Your Shakespeare" (Kiss Me Kate, 1948)
6. "Sweet Transvestite" (The Rocky Horror Picture Show, 1975)
5. Touch-A, Touch-A, Touch Me (The Rocky Horror Picture Show, 1975)
4. "The Internet is for Porn" (Avenue Q, 2003)
3. "Everyone's a Little Bit Racist" (Avenue Q, 2003)
2. "I Believe" (The Book of Mormon 2011)
1. "Springtime for Hitler" (The Producers, 1968)
In summary, when singing these out of context, be prepared to explain:
"I'm not misogynistic, racist, Transylvanian Nazi who's asking for sex, looking at porn, or trying to convert you. I. JUST. LIKE. MUSICALS."