http://www.dailymail.co.uk/sciencetech/a...t-sex.html
The effeciveness of the pill
I wonder if this will mysteriously get shut down too. Or if there is suddenly tons of side effects and it can't be sold. I prefer to take a pill than having some compound injected in my balls (I think that is how RISUG works) or vasectomy.
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Now UK scientists have found the secret of making men temporarily infertile – by ‘switching off’ sperm’s ability to swim.
They have made tiny ‘designer compounds’ which smuggle themselves into sperm, and stop their tails from wiggling. If a sperm can’t swim, it has no chance of naturally fertilizing a woman’s egg.
The effeciveness of the pill
Quote:Quote:
Lead researcher Professor John Howl, of Wolverhampton University, last night described how effective their sperm-stopping agent had been in lab tests.
He said: ‘The results are startling – and almost instant. When you take healthy sperm and add our compound, within a few minutes the sperm basically cannot move.’
Male infertility is often the result of poorly moving sperm, called ‘low motility’. Using this, the Wolverhampton team, together with Portuguese researchers, made a compound called a cell-penetrating peptide, which gets inside sperm and brings them to a standstill. Prof Howl said: ‘This is a totally unique approach – nobody else has ever done this before.’
Peptides are short chains of amino acids that can influence how human cells work. They occur naturally but biochemists can make synthetic versions. Prof Howl and colleague Dr Sarah Jones first demonstrated that certain ‘cell-penetrating peptides’ could smuggle themselves inside sperm cells, like a Trojan horse.
I wonder if this will mysteriously get shut down too. Or if there is suddenly tons of side effects and it can't be sold. I prefer to take a pill than having some compound injected in my balls (I think that is how RISUG works) or vasectomy.