| http://www.w3.org/ns/prov#value | - From BBC News:For a fortnight, 24 women and 22 men kept diaries of how often they engaged in various forms of sex.Then they underwent a stress test involving public speaking and performing mental arithmetic out loud.Volunteers who had had penetrative intercourse were found to be the least stressed, and their blood pressure returned to normal faster than those who had engaged in other forms of sexu
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