2005h-098 adaptation anorgasmy biological biologicalevolution feminism feministtheory fitness health hq29h675h1976 humanevolution masturbation oralsex orgasm psychology qp251l7935c2005 religiousaspects self-help sex sexcustoms sexinstruction sexinstructionformen sexinstructionforwomen sextherapy sexualbehavior sexualbehaviorsurveys sexualexcitement sexualinstruction sexualintercourse sexuality socialscience tantrism unitedstates women