Poes Law and all, I'll take your comment at face value.

Where does your percieved need to produce less children come from?

One could also argue that older people who are more settled in life make better parents.

The article also points out a decline in male friendships. Having a relationship doesnt automatically exclude friendships and vice versa.

Personally I think that choice has a similar influence on both. Approaching people you meet only as potential and exchangeable players for your DnD setting or as partners for your bedroom will turn them away the same way.