Valentine’s day is coming up, which means it’s time to get romantic with your alien loved one. But how exactly do you do the deed with someone whose DNA comes from the other side of the galaxy? How do you negotiate differing erogenous zones and the possibility that your lover may want to eat you after the act? Read our handy primer on getting down and dirty with a member of an extraterrestrial species. If you want to get more in-depth on the possibilities of alien sex, sink your eyes into Ellen Datlow’s Alien Sex anthology. Also, check out our lists of hot…