The person who is the top and penetrates the bottom in the anus.
The person who is the top and penetrates the bottom in the anus. (Insertor, Inserter) In this instance, usually a male, however could be a female, using a strap on dildo. Insertee is the one who takes a penis up their ass. This does not imply gender, as many women enjoy being penetrated in the anus, rather than the vagina. This is the bottom or submissive partner.
An 'insertor or inserter' can also be in reference to the person who will have their penis inserted into another's mouth, for oral stimulation.
Generally referred to as either Top or Active partner.
However, an 'insertee' does not always refer to one who will take a penis into their mouth, (fellatrant).