David Carreras is a sex coach, author and researcher, who writes about natural ways men can improve their sexual performance, backed by science.
He has been featured in Good Men Project, Sivana Spirit, BroBible, Menprovement, and several other publications. His e-book, Mr. Manpower's Guide to Overall Manhood Enhancement has sold more than 20,000 guides since it was released in 2007.
more...
