I recently acquired a new plate and we have been consistently having sex.

The first time we had sex, the next morning I texted her "I had fun last night :)" hoping that a positive reply back would be good evidence in the event she decides to cry rape.

However, if I'm consistently having sex with her (at her place), is there a good way to gather evidence that each instance was consensual just to protect myself? Of course texting her everyday "I had fun last night :)" would come off as weird.