While not a new study, I just came across it. It turns out that men who had 100 orgasms per year had significantly lower mortality (50% lower!). This was especially the case for coronary heart disease. There is a caveat here though. The study only looked at men aged 45-59. So this turns out to be about 2 orgasms per week. In Chinese medicine they historically recommend less frequent orgasms as we age, so I would like to see what happens after 59 if they keep that up. My guess is that in the 60’s and 70’s it might be better to reduce orgasm to once per week and in the 80’s once every other week. In the 90’s you should probably have orgasms daily as a reward for making it that far.
 
BMJ 1997;315:1641-1644 (20 December)