Dom/sub hard limits

Nichole • I'm 25 years old. I've been in a relationship with my SO for 7 years and we have a Dom/Sub relationship.
This is a question for any other ladies out there who are in a Dom/sub relationship.
I'm just curious what your hard limits are, what will you absolutely not let your Dom do.
I personally don't have many. The obvious-no killing, or making me bleed. No booty to mouth or fecies. 
Other than that I'm relatively open to do whatever my Dom chooses to do.