1

Never use the word FABULOUS
(except when you're at a wedding and you have to complement the bride)

2

Don't touch another man's butt
(except when he asks really nicely)

3

Never ride on a motorcycle with another man
(except if you're planning a drive-by shooting)

4

Never tell another guy that he's attractive
(except if the guy is famous and you can get some money from him)

5

When having a devil's threesome, never look the other guy in the eyes
(except when you climax, then it's perfectly fine)

Feel free to leave more in the comments