A comprehensive guide for men and women
Advice for men:
Do: Be extremely nice for at least two full weeks prior to asking for oral sex.
Do: Gauge her mood carefully. Pick a day when she is feeling good.
Don't: Ask on a day that she has had a bad day at work, feels sick, had a bad talk with her mother, feels fat, hair didn't turn out right, feels bloated, is to cold/hot etc.
Do: consider giving her a nice present.
Don't: Attach the present to your penis.
Do: take her to dinner.
Don't: Take her to Red Lobster.
Do: When actually asking for oral sex, make every other word "please".
Don't: Phrase your question in a disgusting way. (ie. Can I wash out your mouth with my man soap?)
Do: Beg if necessary. (It will probably be necessary)
Don't: Wear that shirt that she hates because you were wearing it that time you were "acting like an asshole, in front of those stupid friends of yours".
Don't: Think you can get away with making out for a while, then pushing down on the top of her head.
Advice for women:
Do: Ask politely (asking impolitely is fine too)
Do: Point your finger in a downward direction.