@Paris0 - Unfortunately, as a new host, you're having to jump right in and get a quick dose of human nature that is not flattering or kind. The reality is that sex in your bed, in your house, regardless of who is home or can hear, is pretty normal for Airbnb hosts. Some people will choose to refrain because their moral compass tells them to, but many will not see the issue the way you do (thus all the comments you feel are trolling).
There are going to PLENTY of other areas where people are going to do things you think are "not right" and may find them "disrespectful" to you or your daughter. For example: Playing a show on the TV that you do not feel is appropriate for your daughter to watch. Drinking and swearing or coming home after a night of drinking, swearing, and smoking where your daughter may see, hear, or smell this behavior. Sitting around the house in their pajamas instead of getting "properly dressed". Eating and cooking foods in the home that do not conform to what you normally eat which may cause your daughter distress (too ethnic, too smelly, a particular animal). So understanding that inviting strangers into your home means you are opening up yourself and your daughter to being host to people with different morals, ideals, and behaviors - you can't regulate everything.
Before you take another reservation, take stock. If living with people, even temporarily, who do not conform to your normal views, will be distressing, upsetting, or uncomfortable, hosting may not be for you.
And for the record, if you and your daughter were staying with us in our home (we also home-share), it wouldn't stop my husband and I from having sex in our room if we wanted.