I've just re-read your other post.
His reason for not getting tattoos is perfectly valid though because he gives blood 'regularly' [how he put it] which could mean every 3 months and if he has a rare blood type he could even be called in the middle of the night for a donation if there was a medical emergency. The rules on donation, and I'm assuming they are universal, say you can't give blood if you've has a tattoo or piercing within the last 4 months before donating.
There are EU-wide laws, and then some local bits as well I think.
I've just re-read your other post.
