|From the episode:||Friends Without Benefits|
"Meg and Kent are Having Space Sex" is sung by Danny Smith in "Friends Without Benefits" as Meg Griffin fantasizes about having sex with Kent Lastname in order to rebuild the Earth's population after it is destroyed and they are the last two humans left.
Meg and Kent are having space sex
We can't show it but that's whats happening
[moans from Meg and Kent are heard]