Heck, I don't know if there is a book or not when to introduce the kids. Depending on their ages, and also if both have kids or not. Kids will also have a say in things as well. Also the situation of the relationship counts in that factor. Granted I've not done even a fwb or booty call in years, but that is no kids involved. I'm one that it's like if both have kids. Include them in on some outings and see how things go. Be sure to look at safe public places for the first time around. If someone can not control them self and be willing to settle for just friends to start. I'll pass in a heart beat. Now this is just me. I'm like I don't want to invest a lot of time into someone that isn't going to work out for all of us. It's better to find out early before too much emotional involvement accrues. If it doesn't work out for all. Than the plus factor is that you have made another friend. First time for the adults meeting. No kids. Unless it's like your at a park and everyone is already there anyways, but that's a real life situation and not here on line. May seem odd but normally I like to find out a persons information and run my own background check before kids meet.

Otherwise could spend investing a lot of time on a person. Just to find out that they are not the person to join into the family, and more hurt feelings.