Is it normal to check out girls?
Mostly.Normal for most people
Yes—it's normal to notice and find people attractive. The difference is between a quick look and staring or making someone feel uncomfortable.
Most people notice attractive people, whether they’re single or in a relationship. A glance is ordinary; it doesn’t automatically mean anything deeper about your feelings or your relationship.
Where people differ is what counts as “checking someone out.” A quick look is usually no big deal, while prolonged staring or comments can feel intrusive. Keep it respectful—and if you’re an adult, keep your attention and any flirting to adults.