this is a summary of the questions jefferson asked. the one who claims to abhor biology,
who just so happens to have immense interest in the human anatomy with regards to the reproductive system!!
1. How do you know whether a girl is a virgin or not? (actually LWC qns with jefferson's kind contribution of an answer)
rephrase: how to test for girl's virginity =P
jeff's answer(from his father, which is actually quite stupid la):
test: guy have sex with the girl.
observations: the virgin will bleed - and after this sex, she not virgin liao wth =.=
non-virgin will not produce blood.
THE REAL ANSWER: there is no ABSOLUTE test for virginity.
A woman's hymen can be broken or eroded by masturbation and also a number of nonsexual activities, including horseback riding, gymnastics and physical labor. Furthermore, as with most bodily features, the natural appearance of the hymen will vary from one person to the next; it is even possible for a female to be born without a hymen. Thus, the lack of a hymen is not necessarily an indicator that a woman is not a virgin.
2. Why is a man unable to get "excited" again after ejaculation? by jeff (EH this one is u ask de wad!! no meh.. o_O)
ans: An increased infusion of the hormone oxytocin during ejaculation is believed to be chiefly responsible for the refractory period and the amount by which oxytocin is increased may affect the length of each refractory period.
Another chemical which is considered to be responsible for this effect is prolactin, which represses dopamine, which is responsible for sexual arousal.
3. Why does one not urinate during ejaculation? o_O by jeff -- this one confirm u ask de
Prior to ejaculation, the internal sphincter closes the opening between the bladder and the urethra. It does not relax and open again until ejaculation is completed. This prevents urine from entering the urethra during ejaculation while also preventing ejaculatory fluid from flowing back into the urinary bladder.
http://www.answers.com/topic/why-is-it-impossible-for-a-manto-urinate-and-ejaculate-at-the-same-time
