In fairness, I have not the seen this yet, but I am mystified by its existence. If you don’t know her story, read her books Ordeal and Out of Bondage. The film omits some of the more unpleasant details. Then, knowing what her life was like, watch Deep Throat, instead of the sanitized scenes carefully prepared to titillate but not offend mainstream audiences. I am particularly troubled by the manipulative technique of showing her story twice: first the good, and then the bad, both times out of context. This film just continues the exploitation of a tragic figure.
The film is consistently rated 18A or similar. Look up ratings by agency.