The report’s authors wrote: ‘Surprisingly, spouse longer fully erect penis was associated with increased likelihood of the women having extra-marital partnerships.

‘From these results, every one inch longer penis increased the likelihood of women being involved in extra-marital partnership by almost one-and-half times.

‘Similarly, our qualitative data also support this finding. Women associated large penises with pain and discomfort during sex which precludes the enjoyment and sexual satisfaction that women are supposed to feel.’