E.V.A was grown in the body of a man called Fantomex. She was a physical manifestation of nervous system and at this time she was more like a ship a sentient techno-organic ship that has insect-like legs for landing. E.V.A. can fly herself and can generate electrical charges as a weapon.
Some time in the future, E.V.A. develops into a sentient being with a more humanoid appearance:
Can you cheat on your nervous system? Isn't having a relationship with someone while your nervous system may or may not have sentience a conflict of interest? Technically is sex with Fantomex considered a threesome?