According to a study published in the Journal of Sexual Medicine, penises longer in length make women climax more often.
“Research indicates that women's orgasm during penile–vaginal intercourse is influenced by fitness-related male partner characteristics, penis size is important for many women, and preference for a longer penis is associated with greater vaginal orgasm consistency,” write the study authors.
Female participants were asked how much sex they were having and whether a particular sized penis was effecting the frequency of their orgasms. Turns out lengthier steel beams took the chocolates.
“Women who prefer deeper penile–vaginal stimulation are more likely to have vaginal orgasm, consistent with vaginal orgasm evolving as part of a female mate choice system favouring somewhat larger than average penises,” continue scientists.
If you're not sure how your Johnson fairs, here are some handy sex positions to make sure she gets off.