The most promising of the many experimental HIV vaccines in development will offer only limited immunity against the deadly virus,US government scientists said recently ahead of world HIV Vaccine Awareness Day.Unlike classical vaccines,the first-generation HIV vaccines will not enable people to fight off the virus,but may protect their immune system from the worst ravages of the virus and dealy the onset of AIDS.And because patients are at their most infectious when viral levels are high,such vaccines might also reduce the spread of the sexually transmitted disease,making it a useful tool for public health authorities batting to contain the global HIV/AIDS pandemic."There is optimism that even a less-than-perfect vaccine could benefit both individual recipients and the at-risk community," said the authors in a commentary published in the "New England Journal of Medicine."It is still not clear when the first vaccines will be available.
A man usually needs about two or three minutes of stimulation to have an orgasm,a woman generally needs 10 times more. For a man,an orgasm is instinctive.For a woman,it happens only after direct stimulation of the clitoris. A man's climax usually lasts for 10-13 seconds.For a woman,it lasts 6-60 seconds. A man must recuperate after an orgasm but a woman can have repeated orgasms within minutes or in rapid succession. Wonder why a man rolls over and sleeps after? During sex,his body releases oxytocin,a hormone that induces drowsiness.A woman is more relaxed after sex,which is why she wants to talk or cuddle.
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