/sci/ - Science & Math

http://news.bbc.co.uk/2/hi/health/3128753.stm

>could scoop out more than 90% of the cornstarch mixture with just one thrust.

>from surveys of students, to indicate that sex tends to be more energetic if the women is suspected of cheating, or if the couple has been apart - suggesting a sub-conscious desire on the part of the man to rid his partner of any trace of another's semen.

>"We theorize that as a consequence of competition for paternity, human males evolved uniquely configured penises that function to displace semen from the female vagina left by other males.