Up The Duff

This was on the back of a Kronenbourg 1664 can that I enjoyed recently. I couldn’t quite work out what it’s trying to say. I think it means that the can contains 2.5 units and, if you have more than 3-4 units, you might get someone pregnant - which is apparently not allowed..?
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I think it means getting your wife pregnant can be injurious to your drinking.
Yeah, that as well.