in the act

1. In the process of doing something. For example, The police caught the robber in the act , or I was in the act of closing the window . [Second half of 1600s]

2. Performing sexual intercourse, as in Her father caught them in the act . [Late 1500s]

Example Sentences

The questions begin to arise from his in-the-act sex photographs, sometimes with multiple partners.

From The Daily Beast

I feel so stuck still here, and always caught-in-the-act like that photo.

From Project Gutenberg