According to a recent study funded by Church and Dwight Co. Inc, the maker of Trojan products, women are more likely to orgasm when oral sex, or cunnilingus, is included in foreplay. Seventy percent of women between 20-24 reported receiving oral sex during sex—so guys, if you’re not going down on your girl, you’re not measuring up to the majority of women’s sexual experiences. If a lack of knowledge or experience is what’s holding you back, read this step-by-step guide and don’t give yourself any more excuses for getting down and dirty.