Is heat stressing my cat out?

[Garey]

So my kitten has been going in to heat every few weeks for a couple of months now and I don't want to get her spayed, but I wanted to make sure it's not harmful to her. I actually like when she goes in to heat. She gets really cute and really sweet and her mating noises are adorable, but sometimes the howling gets really loud and it worries me. I don't want her to be in pain or be really frustrated every time this happens and I'm female, I know human cycles aren't very fun (i.e extremely painful and stressful). Is there any reason to get her fixed, other than she might get impregnated?