today my fried ricky told me u have to put ur balls into a girl to have a kid, other wise sex doesnt work

if thats true then how do i fit my balls in a girl so we can make have a baby? ? i saw my little sisters private part once and it looked too small is he (ricky lying? rick y said his dad was special forces once and i asked his dad and it turns out he was making it up so i dont believe him anymore !