Why is mom suddendly interested in "dating" life?

My parents are divorced and after living on my own for a while I've moved in with my mother because she has a big apartment in the city near my university.

We have never spoken much about sex or boys etc when i was growing. Just the minimum sex ed speech.

But yesterday she told me outright that she doesn't care if i bring guys home to have sex and that she doesn't care if she can hear it.
She said it would be good for me if I got some "attention" and that im not a child anymore and shouldn't be shy about such things.

Why is she being so awkward like this now?
Why go out and say that?
Why is mom suddendly interested in "dating" life?
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