Are blood donation questions reasonable?

[Sundae]

Over here you can't donate if you've had penetrative sex with another man, but it doesn't ask women if they've ever had anal sex. Always thought that was a little skewed. Lifetime ban for gay sex, intravenous drug use or sex workers.

Pierced and tattooed people can give (after a set time - 3 months I think, like Oz), although many people believe they are also banned for this reason,

If anyone in the above groups was willing to challenge it in the UK I'd be right behind them. I am always trying to push people into giving blood ("Yes, I hate needles too, I cry every time I give blood from the sheer revulsion of feeling the tube on my arm" etc etc) and am usually met with apathy. It would be a refreshing change to hear someone is fighting in order to do so. I can only assume the time and money spent in extra testing don't make the additional amount of blood viable though.