Hello -
While the ideal would be to ask his doctor directly, since the doctor would know all the specifics of his case, I also realize a lot of people feel very uncomfortable with this line of questioning, so I'll try to give you some guidelines to use. First, the exertion involved with an average sexual encounter would be the equivalent of climbing a flight of stairs. This isn't considered strenuous as a rule, but is exertion. The problem that arises is that with sex usually comes both an increase in blood pressure and cardiac output, and, if it takes place horizontally (as it frequently does, at least at some point), then intracranial pressure is increased on top of the already (though temporarily) increased blood pressure.
This could pose a problem for a while yet, since there was apparently a bleed on the brain. While things have are no doubt coming along well, it wouldn't be a good time to test how well the healing process is coming along. (This also, and especially, applies to heavy lifting or other straining, which also increases pressure inside the head). In a few weeks (actually by now) it should be perfectly safe to ease back into the regular routine, but he should be aware of anything that doesn't feel right (head-wise, especially).
You mention also he's been diagnosed with Marfan syndrome. I hope he will have this followed proactively, as sometimes this can cause serious problems with the eyes, joints and, most especially, with the heart and great blood vessels. There is no specific contraindication regarding sex, but he should be aware he is more vultnerable than average to problems in the above-named areas and should have a chest x-ray and
echocardiogram probably yearly.
I hope this is helpful to you. Best of luck to you both.
