Ever wondered why the French refer to an orgasm as "la petite mort"—"the little death"?
Because both, death and orgasms, are ecstasy.
The only difference is that from death you do not return to your body after "standing outside yourself," per the original meaning of ἔκστασις.
Conversation
Ever wondered why they both have been taboos throughout the history of human culture?
Because ecstasy dissolves culturally conditioned boundaries of identity, which the culture needs to exert power and control over its people.