Same I’ve never asked for contacts but if I get along well with someone I’m happy to swap details if I get asked.
There was one time 2 girls I had seen at a shop texted me out of the blue. They had taken my number from the shop mobile but didn’t have the courage to do it by themselves. Thought that was pretty cute. I ended up seeing 1 of them privately for over a year and had some incredible times.
My current regular asked me for my instagram lol. Had to fumble out a reason why I couldn’t and she asked for my mobile instead. Now she texts me about anything and everything!