Literally, if women are from Venus and men are from Mars, how long do you think before they start trysting on Earth?
Men and women, how long do you think the same specie bonding and co-existence arrangement would last? Would an arrival of a third party alien race change things? In what possible form this alien race might come?
Follow up question, what if an alien race invades Earth and abducted all of our women, leaving all the men? Or vice versa. How long do you think before the orphaned party could survive?