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Doctor Robert "Dr. Bob" Rubel has created a book and companion workbook focused on cisgender heterosexual men (but also applicable to pansexual and bisexual people who participate in vaginal sex) created because (in the author's words). "If I'd had such a book decades ago, it would have changed my sex life forever."
The companion workbook includes exercises and research to advance your study of great sex!
Sexual technique for great vaginal sex