Sex faries work better in situations where copious alcohol is applied to all parties, or when a high degree of lust renders the targets unable to function correctly. (Sex faries can be prayed to if desperate, and are more likely to exist than God)
-"There must have been some bloody sex faries in the air. I will never live this down"
-"Oh Magical Sex Fairy, please please PLEASE let me have one night with Danny, and I'll never ask for anything again, I swear!"