You can’t test-drive a mattress for its sexual compatibility, but there’s nothing to stop you from lying down on a few mattresses before you buy. In fact, mattress-buying guides suggest you do just that. Go mattress shopping with your partner and plan to spend 15 minutes or so trying out each mattress you’re considering. Lie down on your back, face down and on both sides. Turn several times, and see how much bounce you and your other half feel. A serious, professional mattress salesperson won’t mind you trying before buying.