There are two groups of sexual abuse I can think of and that is Child & Adult. I am going to cover Child abuse first followed by Adult.

https://www.childline.org.uk/info-advice/bullying-abuse-safety/abuse-safety/sexual-abuse/

https://www.nhs.uk/conditions/social-care-and-support-guide/help-from-social-services-and-charities/abuse-and-neglect-vulnerable-adults/