Well a book could be written on the subject, but I will try to paraphrase. As human beings we must pass on our genes in order for our species to survive. It is our basic function. This is why we have feelings such as love and lust, it is all set up so we procreate. Every healthy human male specimen should strive to pass on it's genes. Genetic diversity is what helps species survive.
If you don't procreate and pass on your genetic material you fail.
Socially males who raise offspring which are not there own are looked down upon. Most people in our society will not admit it, because this kind of honesty is looked down upon. No one wants to be a social pariah. The first thing when I read your post and saw 3 kids not my own I immediate thought to my self what a wuss!!!. The second thing came to mid was of overweight balding male who has problems attracting women being brainwashed by a single mother of 3 into being the temporary father figure for her kids. A man she could never be attracted to sexually. He is only attractive as means of support. When the kids get to be 15 16 and they start to rebel, the first thing you will hear is you are not my father if you try to discipline them your wife?gf? Will say don't talk to my kids that way
A good friend of mine was about 24 and met a single mother of 3 she was about 32. No one wanted to say anything to him especially not his family because the didn't want to lose the relationship they had with him. They got married quickly she couldn't wait

6 months later he put on 60lbs and worked 24/7
His wife was glad to see him every time he came home. During the day since she quit her job to stay with the kids, she would meet up with her ex to get what she really needed from him. Lets move 5 years ahead he is even fatter then he was works just as hard wife still cheats on him. All of his friends think he is a wuss but no one wants to say it to his face. His mother and father all smile and want to see their grand kids but they admitted to all their friends they are miserable because of this situation.
When I read what you posted I immediate though of him and the giant mistake he made. Never raise kids that are not your own. It just reeks of fat wuss. Pleas don't take personal offence I don't mean to insult anyone. I just really believe that any many that doesnt have his own genetic offspring is a failure as a man and especially when he raises offspring that are not his. :thumbsdown: