Why You Should Use a Sex Swing And be sure to check the weight limit. This is especially important if both of you are planning to climb aboard and try a weightless iteration of a classic partnered position like missionary or spooning. The Best Sex Swings to Buy Now that you know know how to use a sex swing, onto where to buy them. Good news: They’re probably less expensive than you might guess. “You really don’t need to spend more than $100 on one,” says Stubbs. (That’s actually less expensive than most luxury vibrators!) Invest in one of the four sex swings below, then give it a try.