Dental dams are an STI prevention barrier used during oral sex for vulva owners. It is a rectangular flexible piece of latex that can be placed on top of the vulva before oral sex. Dental dams are a one time use products like condoms.
Sources:
https://www.verywellhealth.com/what-are-dental-dams-906812
https://www.webmd.com/hiv-aids/dental-dam-how-to-use
https://www.cdc.gov/condomeffectiveness/Dental-dam-use.html
https://www.healthline.com/health/healthy-sex/dental-dam#_noHeaderPrefixedContent
Vasectomy is a surgical procedure that prevents the sperm from leaving the body. In this procedure, the vas deferens is cut and sealed. This doesn't cause any change in the semen produced in the body,
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A diaphragm is a shallow, flexible cup that is used as a barrier contraception. It is inserted in the vagina to cover the cervix during sex to prevent the sperms from entering the cervix and fertilizi