Is it possible ... to avoid pregnancy if you threw up or have stomach ache (then poop)? after that, take birth control pills?

it rejects the sperm from wandering around in the body. and safer with pills.

The digestive system is totally different from the reproductive system...it is just that the excretion area is close to the genitals...the sperm would make its way through the vagina, not the urethra or the a-hole...

^^exactly. if youre talking about swallowing semen..it does nothing. the girls stomach acid will kill the sperm anyway.

Agreed

okay, nevermind :] thanks. ahaha. my friend was discussing about that. i was like ... "hm, i dunno.."