When it comes to sex we are usually talking about involving 3 of the bodies complex systems. The are the digestive system, the reproductive system and the excretory systems(your anus where you poop from) which is also part of the digestive system as it carry's the digestive waste from the body.
While sex can be had with all three of these system only sex through the reproductive system which is entered through the vagina can result in a pregnancy if some form of contraceptive is not used [ adviceman49's advice column | Ask adviceman49 A Question ]
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