The act making breakfast burritos for you and your partner in the morning and engaging in morning sex (sexual intercourse before 12:00pm) afterwards. Can refer to the burritos themselves, the sexual act itself, or both.
She stayed over last night and luckily I had tortillas and eggs so we had sexfast burritos in the morning.
When one member of a couple (usually the girl) proposes an unnecessary temporary ban on any sort of physical contact.
1)
Marie: Marc, I think we should not make out for like a month.
Marc: Aw, girl, you're putting me in a sex fast?!?
2)
Roommate #1: Dude, why have you been so testy lately?
Roommate #2: Dude! I haven't gotten any love for like 2 weeks!
Roommate #1: Dude, why not?!?
Roommate #2: Dude, Lauren thinks it's a good idea to take a break from the touchy-feely for a while.
Roommate #3: HAHA! Sex Fast FTB!!!
Having such a long, wild, athletic sex session with so many positions that you feel like you just got a serious workout at the gym.
Ursula: Wow, girl. You look exhausted. What have you been up to?
Maria: My man just spent the last 12 hours doing naughty sexnastics with me. I need a nap!
Ursula: Now I know why he's in such good shape.