Hardest Part of Writing Sexfight/Titfight Stories for You?

[Rivals_Rapture]

There are a ton of active people on this forum, not all of whom are writers, but for those of you that are:

What is the hardest part for you when trying to write sexfight/catfight/titfight stories? Or the hardest part about writing for you in general?

For me, my most pervasive and frustrating issue is trying to figure out ways to start a sentence differently than I have before, to avoid repetition (not that I am always or even often successful at that).

Second, figuring out nicknames or titles by which I can refer to heavily involved
characters without just re-using their names over and over again.

How about for all of you?