You could always get a job as a teacher or pediatrician or some other "plays with the kids, helps them out, then hands them back over to their parents" type job.

"have empty meaningless lives"

Absolutely not. If you have kids, ALL you can do is raise kids. If you don't, you can spend all that time of whatever you want. Curing some disease. Inventing something cool. Writing music or painting masterpieces. Save lives, teach kids, volunteer in a soup kitchen or an animal shelter. Whatever will make your life meaningful and fulfilled, you can do, without having to feel like you're neglecting your parental responsibilities.

"having dinner with just one other person every single day can be monotonous"

Then don't. That's what friends are for. Or other family. Eat with your parents one day a week, his parents one day a week, and have dinner with a different friend one day a week. Or eat out at a different restaurant once a week. Get a group of people you like and alternate who cooks, or pot-luck frequently. I don't know where you are, but where I'm from there would quite often be local events that were basically excuses to sit around and eat publicly: benefits, concerts, festivals (especially in late summer and fall), church dinners, charities, nights out at the theatre.

"try to fill the void with endless drinking and clubbing nights"

Or books (writing or reading) or friends or games or charity work or art or music or dance or science or exploring or creating or loving or living! Children give you a sure-fire way to fill day, but you can't turn them off for a few hours if you need quiet time, or want to do something for yourself. There are so incredibly many things you could do and love doing that I'm not sure even the vast internet can hold them all! Pick a craft to learn. Learn a new language. Start a garden, grow everything you eat. Live life! There shouldn't be much of a "void," and if you do start to feel empty, you don't HAVE to fill it with anything you don't want to fill it with. Pick something that you enjoy or is meaningful to you.