@Sonia848 You can request the full names of both occupants when the booking is confirmed, but this doesn't really tell you well the guests know each other.
The best way to avoid casual hookups is to set a Minimum Stay of 3 nights or more. Nobody wants to book multiple nights for a one-night stand. You should also make it clear - both in the House Rules and at check-in - that no additional visitors are permitted on the property at any time, and be prepared to enforce that.
Another option: as an in-home host, you are permitted to rent only to guests of your gender without violating the discrimination policy. So if you and your daughter feel safer with only female guests, and don't mind some loss of potential income, you can consider this.
You may also choose to rent only to 1 person at a time, although it's hard to see how this would be helpful from a safety perspective. A frustrated single man lingering around the house seems more potentially problematic than two people busy in the bedroom.
No matter which route you go, I recommend not using Instant Book and making sure you are comfortable with the communication before accepting bookings. Have locks on your bedroom doors and a plan in place for how you will remove a guest if their behavior is dangerous or inappropriate.