The decision to have children is one you can never take back, and for that reason the enormity of it can be quite overwhelming.
Once you have a child , the worse thing in the world would be to not have them anymore. I don't know how people that lose children carry on.
I think as a man the decision starts with getting into a LTR, and the often unspoken agreement that children will at some stage follow.
Regret is a perhaps the wrong word..I'm definitely jealous of couples without kids, and even more jealous of single friends..but then they are jealous of me.
I think, with planning and the right support network the only thing you can't really do is have a lovely weeks , adult beach holiday..just relaxing , reading, eating , drinking, site seeing etc without having to entertain kids. Even if you could get away you would be worrying about what's happening at home, and obviously if I went away for a week I would miss my 8 year old terribly.
Maybe you just wish things were different now and again, rather than regret having them?