I would guess - things like "less desirable" men not being able to find a mate, teenage pregnancy, single motherhood, STDs, rape ...

But yes, those don't seem to be things liberals complain about more than conservatives; I'm not sure if Vladimir was implying they did, or talking about something else.

(Personally, I can't tell if there really is "unprecedented amount of hand-wringing" or if it's just availability bias - it's easier to think of examples of people complaining now than of people complaining 50 years ago)