tankee1981 SG Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal http://bmj.bmjjournals.com/cgi/content/full/319/7225/1596 Volunteers?
foga SG "A glass test tube as big as a penis in erection inserted into the vagina of female subjects who were sexually aroused by clitoral stimulation (occasionally with a vibrator) guided him in constructing his pictorial supposition." like very seh qin like that.....
tankee1981 SG In the event that the female's vaginal wall is strong enough to break the test tube during contractions while having orgasm, how they take out the pieces sia?
DriftingGuy SG ".....We did not foresee that the men would have more problems with sexual performance (maintaining their erection) than the women in the scanner. Looks like guys are more private than gals when it comes to sex Only the first couple was able to perform coitus adequately without sildenafil (experiments 1 and 2). The reason might be that they were the only participants in the real sense: involved in the research right from the beginning because of their scientific curiosity, knowledge of the body, and artistic commitment. And as amateur street acrobats they are trained and used to performing under stress. And not everyone can perform when others are watching
