Auto: prefix relating to self or to same individuals
Prude: a guy or girl who's afraid to do anything sexual or kinda shy around the opposite sex, but not a fag or a lesbo.
Hence, an autoprude person, usually a woman (also known as an A.W.), is a person who doesn't, or denies being involved in, any sort of sexual stimulation of oneself.
-My girlfriend is never down with touching herself, she just likes it when I give it to her.
-You mean she's an Autoprude?
-Damn right dawg, a god damn AW