There are plenty of ways to keep warm on a chilly night of camping, but the Alite S.H. Sleeping Bag ($120) — even though it's rated to 20 degrees fahrenheit — was made with one particular method in mind. Designed to allow the sleeper to easily zip one or more bags together, these bags were made for you to have sex in (we'll just let you guess what the S.H. signifies). But, that's not all they're good for. In addition to the zippers on either side, these bags also feature a center crotch zipper, padded feet, and built-in fleece slippers so you can open them up at the legs and walk around while wearing them. Arm holes let you free your appendages up for a wide range of motion, while a drawstring hood lets you cinch things down tight.