Another old one..

Pensioners Bert and Ethel decide to marry and spend their remaining twilight years together. As they snuggled up on their wedding night, Ethel began to worry that her heart condition may be a problem if the action gets too vigorous…

"Darling" she whispered in his ear "There’s something I need to tell you – I’ve got acute angina"

"Just as well…" he whispered back "…’cos you’ve got lousy tits"….