Did Ivy have sex with her plants?

Yes, she calls Bane away so she can be alone. She loves plants more than humans and based on the plants' sizes and shapes, they must give her much pleasure. Ivy may have also used the plants for impregnation/pollination since seems to literally be Mother Nature since it can be inferred that she gives birth to seeds and some of the plants are biologically her children since they contain features of both plants and humans. Plus, there is a major costume change when she arrives in Arkham so she would have to have been naked at some point between scenes.

I saw there is a new Poison Ivy comic book in which she uses her plants to have babies. It might be of interest in relation to the subject.

Have you ever heard of tentacle porn? It's likely the same thing more less

(looks around confused) "Good night, everybody!"