In norse mythology Loki had quite a lively sex life. Not only did he have children with his wife Sigyn, the giantess Angrboda and the stallion Svadilfari. He also had the habit of changing into a beautiful Maiden and seducing Midgardian men. There used to be a lot of men, especially black smith and druids, who claimed to be offsprings of Loki.
Yo momma jokes just acquired a whole new level of creepy.