BBC News
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image captionMartin (left) and Carl were 'thrilled' to be able to give blood
Married couple Carl and Martin have given blood in what the Welsh Blood Service has described as a "landmark" moment.
Until now men who have sex with men had to wait three months before donating.
From Monday, gay men in sexually active, monogamous relationships can donate for the first time.
Anyone who has had anal sex with a new or multiple partners in the past three months will have to wait three months to donate - regardless of their gender.
It follows a review by the Fair (For the Assessment of Individualised Risk) steering group, which concluded switching to an individualised, gender-neutral approach was fairer and maintained the safety of the blood supply.