We have one female controlled demon at the moment, but I think Scribbles is talking to her about partnership. However, since Witch players have the final say in who plays their Demon partner, you are free to drag in someone else if you are not comfortable with any of the current posted demons and/or their players.
Note also that not all Demons even have the option to have sex with their Witch partner. Some lack the required organs. Also, the Demons wouldn't be the only possible characters to have sex with.
Either way, the point is somewhat moot. Both Kate and Giulianna have been working on their characters and sent me stuff through PM, which means that they will most likely fill the last two Witch slots.
I could PM you if a slot opens up at a later time.