‘I wish to propose to you a new term, one that has been missing for a long time: βcirclusion.β It denotes the antonym of penetration. It refers to the same physical process, but from the opposite perspective. Penetration means pushing something β a shaft or a nipple βΒ into something else β a ring or a tube. Circlusion means pushing something β a ring or a tube β onto something else β a nipple or a shaft. The ring and the tube are rendered active. Thatβs all there is to it.’
– Bini Adamczak, On “circlusion”