kneeling at the altar 

Sexual position in which one person kneels down in front of another and performs oral sex. Receiver can be male or female

He was kneeling at the altar before they had sex

kneeling at the altar by HS5120 September 5, 2015

kneeling at the altar 

Sexual position. When a female kneels to give a guy head.

Example 1
Guy 1: How'd it go last night
Guy 2: awesome! She was totally kneeling at the altar.

Example 2
Woman: I'm gonna kneel at your altar later

kneeling at the altar by ManAtTheStar July 10, 2013