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Exercise, especially aerobic exercise creates Nitric Oxide in the blood. Nitric Oxide is a vaso-dilator, increases blood flow. This is good when diving as it reduces both size and quantities of micro bubbles which form on every ascent. Diving isn't really aerobic exercise but you can tell your missus that it is, AND, as a vasi-dilator it means you get harder erections
Or you could tell your missus that sex is aerobic exercise and that having sex before and after diving means you are less likely to get DCS. I can find the research document links if you want.