No. Otherwise SexFace would never have fucked Lampito.
They just have to have been involved in sexyteims with the other person. Penetration usually but extended mutual oral/manual sex also counts.

EEEEEEEER PSYCHOCHOMPED ON KERSAL'S BOYISH SLIT
( TFD is sporting this season's finest necropants, Wed 17 Mar 2010, 11:45, archived)

I bet they both cock jousted
and when they spooned her arse bruised Chomp's pelvis.
( Donkey Gums @mattcomedy, Wed 17 Mar 2010, 11:58, archived)