Older woman (friend) asked me 18+ questions

Not sure if this should be a NFSW post but, I have this friend, she's just over 40 while I'm in my mid 20s. We chatted ocassionally and over ussuall stuff. We also met 2 months ago for normal chat over coffee.

However I was shocked how she asked me some really unexpected questions. She asked if she can ask me anything, I said sure and then she asked me how often do "I m@sturbate" later on she also asked me about my "size" and she said "oh that's nice". I did play along with her a little as I did try to see if she's really flirting with me or why.

She then said, "sorry I was just so nosy, don't mind me", we chatted normal as if nothing and then some time later she asked me what sort of boxers do I wear, I played along and asked her about her night wear, she told me.

However, what could be the reason for all this sudden chat? Maybe she's flirting, IDK, but surely she would make it more obvious than that. I could listen to what she said being curious but I wonder why questions like that