If you have a cup (Vagina) with Pepsi (ovaries, Fallopian tube).
You would need a Straw (Penis) to get the Pepsi out of the cup and into your mouth (Uterus).
Then you put your saliva (Testicle) into the top of the straw (Epididymis, Vas Deferens) it then turns into backwash (sperm).
Once you get home from the restaurant you leave your cup out for a while and soon your straw will go into the garbage (Seminal Vesicles, Prostate Gland,) and end up in its final resting place (Urethra) the garbage dump. However, the cup will get refliled and the rest of the drink will come out of the cup (Cervix)