1. Someone who constantly uses the sexual lubricant Astroglide while getting laid.
2. Someone who enjoys having sex while he or she is under the influence of drugs.
1. Vicky: (naked on her bed) Hey honey are you ready yet?
Brad: (in the restroom getting undressed) Yeah baby, but just hold on one second. *rubs a bunch of Astroglide on his penis while muttering to himself* Woohoo! I'm gonna fuck this bitch into orbit!
2. Jenna: Alright, baby now that we are both naked, you know what we should do before foreplay.
Jason: Hell yeah, so we are gonna feel like we're actually making love like we are far up above in the heavens! *dishes out the joints and LSD*
Any individual who has an excessive fetish for outer space or astronomic topics as to (almost) turn it into a sexual tendency
While zoophiles spend their leisure time in barns or pet stores, astrosexuals spend most of their time locked inside local observatories allegedly "searching the skies for new discoveries"