The fact intercourse causes so many infections and tears and warts attests to the unnaturalness of intercourse, that it’s not meant to be. The vagina’s primary function isn’t to be penetrated by a penis but to eject a baby for birth. They are two muscle tissues / sphincters pressed against each other to help the baby be pushed out. Penetration of the penis into the vagina is completely unnecessary for conception.
Lastly, from a structural point of view, as a class oppressed by men, we are not in any position of freedom to negotiate what men do to us collectively and individually within the heterocage.
Welcome to the heterocage. Two men enter, one man leaves.