What happened with Zeus was that he disguised himself as an animal and to get close to women and then had sex with them. Or he used magic to convince womwn to have sex with him. Diana didn't choose for Steve to enter another man's body. And the reason why Steve had sex with Diana was because he felt like it was his body at that point. That other guy, he wasn't there. He wasn't anywhere. He no longer existed. Steve was the only person in that body. And while Zeus can be a metaphor for manipulation, I don't see how reincarnation can be a good metaphor for anything.