Define relation relation synonyms relation pronunciation relation translation english dictionary definition of relation n 1 sex sex activity . The descent of man and selection in relation to sex is a book by english naturalist charles darwin first published in 1871 which applies evolutionary theory to . Human sexual activity human sexual practice or human sexual behaviour is the manner in which humans experience and express their sexuality people engage in a . When sex is no longer a priority is there an underlying relationship problem kenedy singer opens up and wonders how important is sex in a relationship
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