In sexbiz, protective measures are called "covers" before and during a meeting with a customer; i.e. You should always have a contact and trusted person within reach - the cover person.
Similar to some reputable escort agencies, all contact details, real name and address of the customer are stored there before offering a hotel or house visit. You should inform this person personally at the beginning and at the end of an appointment that everything is OK. If a date is exceeded or extended, always contact your contact person beforehand. Not by SMS, but with a short call.
If your contact person does not hear from you within a given period and cannot reach you, they will have to contact the police. This is a control measure that serves your protection. Serious customers understand this.