For some animal, it is deadly. I think, if we have a specific kind of an aneurysm in our brain, we can also die during sexual intercourse. That particular aneurysm can burst when we are straining during defecation or orgasm. Some people even died after masturbation although it is a sporadic condition. Of course, women don't eat men but for both gender and a specific kind of population, sexual intercourse can be deadly.