Panel 1: As John and Elly get ready for bed, Elly does something rare and wonders where Michael might be. John makes the mistake of assuming that his wife is aware of much outside her very narrow reference pool and suggest that he and Gordon are probably cruising.
Panel 2: Since she spent most of her teenage years at home crying about how no love lasted or staring at her bedroom wall convinced that she'd die an old maid, she has to ask him what he means by cruising. He explains that when he was Mike's age, he and a bunch of his pals would clamber into his dad's ride, drive around aimlessly and hoot at girls.
Panel 3: The fact that she was not hooted at displeases her and makes her say something stupid about how boys have evolved past that.
Panel 4: We then see that for some reason, Brian is with Mike and Gord not impressing women in their mid twenties.
Summary: Lynn has no real idea why boys behave the way they do. She also doesn't care because she doesn't like it.