Sexual relationships with spirits who specifically attract sexual partners

I hear people talk about having relationships with spirits. However, how does that work with spirits like Sitri or Gremory who are noted to attracting other partners? It seems like dating your own dating coach.

To those of whom had relationships with either of these two spirits, or similar ones, how has that worked out? Did they prefer to be monogamous? Did they let you see other people, even helped you find some?