Some sex positions are popular because they’re easy. “The Apex position is not for the faint of heart, but the payoff can be well worth it for those up to the challenge,” says certified sex therapist Jenni Skyler, PhD, a sex expert for . “For many couples, the athletic aspect of the Apex is part of the thrill, along with deeper penetration.” Skyler adds. “If you’re in a rut or want to explore some not-so-vanilla positions, Apex adds an element of adventure and playfulness.”But playfulness only goes so far. do the Apex, plus a few easier variations.