While standard MP4 files are data containers and generally safe, hackers can sometimes embed malicious code or use exploit kits on the websites hosting these files to infect your device without a direct download.
If you are unsure of a file's safety, you can use online scanners like NordVPN's File Checker or local software such as Malwarebytes to check for threats. General Context: Female Sexual Health
If your interest is in the subject matter rather than a specific file, it is a widely discussed topic in health and wellness. Is Masturbation Healthy? - Planned Parenthood
Files with generic or provocative names like "girl-masturb-014.mp4" are common vectors for malware.