Everyone is entitled to their opinions. I think it helps if you have been in the situation though, it gives a better perspective.
After our ...... had reached 5, my exwife fell pregnant again and was convinced it was mine, although she was having on ongoing affair with her boss at the time. After my some was born I treated him like my ......, as you would.
After a couple of years we tried again and she caught immediately, basically on the first fuck, and another ...... was born. Shortly after I had to go working away for 2 months and when I got back she was as horny as hell, even to the point of dragging me into some woods on the way back from the airport and stripped naked and banged me senseless (not that I minded) the following month low and behold another ...... was born. We broke up when the youngest was just 3, but I got custody of all the kids. After a couple of years growing it became obvious I wasn't thier father so I did a DNA test on all the kids. My ...... was mine but the lads wasn't.
The moral of the story is:
It doesn't take a biological dad to be the father
It takes a man to be a real father