Mechanics of a threesome?

Like many guys, I often fantasize about taking on two girls at once. However, I have this problem where I can not host any fantasy that isn't practical. So, this has given rise to me coming up with various positions and methods for successfully taking on two girls at once. Keep in mind that each of these require that the girls involved be at least a little bi-sexual. Also, if anyone feels like using this as pointers, remember to take proper precautions before varying from anal to vaginal or oral sex. Feel free to add ideas. Also, I haven't actually had a threesome, so if you've tried anything below, tell me how it went! "Two halves make a hole" alternative title "The glue that binds" This would be considered a 'warm-up' or foreplay. For this, the two girls lay down (one on top of the other) and make out. The guy puts his penis between their bellies. He should remain motionless so they can rub their clit on his penis as they warm up. "Hungry Kittens" The guy sits or lays over some ledge. The girls get between his legs and pleasure his testicles and penis orally. "The Lazy Bird gets no Worm" The guy lays over some ledge. One girl gets into the 69 position with him while the other nestles between his legs and pleasures his testicles orally, and assists with his penis (when she allows). "Hungry Puppies" One girl lays on her back while the other girl lays on top of the first girl, pleasuring her nipple orally. The guy enters the second girl from behind (vaginally or anally) and pleasures the remaining nipple of the first girl orally. Also allows for both to finger the bottom girl. "The Ark of the Covenant" the guy lays on his back. One girl straddles his penis and the other straddles his face. The girls are facing each other and can make out with each other as desired. "Controlled Intersection" The girls get into the 69 position with the bottom girl's legs hanging over a ledge. The guy gets behind the girl on top. The girl on bottom determines where the penis goes (into her own mounth, into the other girl's vagina, or into the other girl's anus). The guy should give each a few thrusts before pulling out to allow the girl on the bottom to change her mind. "Hungry Puppies (variation 2)" One girl lays on her back while the other gets between her legs and performs oral on her. The guy enters the girl on top (either vaginally or anally) and assists in giving oral sex to the girl on bottom. "Roller Coaster" The guy lays on his back. One girl straddles his face, facing away from his penis. The other girl straddles his penis and is facing the backside of the first girl. The first girl bends over allowing the guy to pleasure her vagina orally while the second girl bends over to pleasure the first girl's anus orally. "Mating Connector" The guy lays on his back. One girl straddles his penis in the reverse cowgirl position and leans forward. The other girl stradles his face and leans forward to pleasure the anus of the first girl orally.