A while back we told you that Dock Street’s brewers and the kitchen staff at the Four Seasons Hotel were getting it on all collaboration style with “Spanish Fly,” the fourth in their ongoing “Beer For All Seasons” project. The beer was brewed with wormwood, yarrow and other herbal aphrodisiacs grown in the hotel’s rooftop garden. It’s been bottled, and is now ready to start getting busy. For its official launch tonight, the Four Seasons’ Swann Lounge is offering the sudsy love potion for $5 a bottle, and pairing it with $1 oysters, and other bar snacks. The fun starts at 5 p.m. Be sure to wear clean underwear in case, you know, the whole thing goes orgy.