Lol, uh, there's no danger from sex after diving. If there were, I'd have been dead long ago.
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I'm trying to figure out how this post is related to the OP's question.It sounds like if you hve been 6 hours or so at a gazillion feet there may be a problem. My suggestion is to error on the side of caution and take a more laid back approach to things. Engaging in highly reduced physical activities. Then when one is done trade places. Always remember teh key to physical fitness can not be achieved with out a strict program of diet and exercise. So trade the marathon for some isometrics of sorts. If you are concerned about too much bottom time for the day then insure the appropriate amount deco mix and use it sparingly at your deep and safety stop. and all will be well.
if you are talking about sneaking to the back of the diveboat after a near limits dive for a quickie with the dive master I wouldnt recommend it.