I can't stand having tan lines but unfortunately I do. I ride my motorcycle a lot and wear gloves and a sleeveless shirt when I do. So I have tan lines at my wrists and upper arms. I no longer have anywhere to go to sunbathe in the nude so I have a little bit of a tan line around my waist as well. Though this summer I didn't spend too much time outside in the sun shirtless.
LOL - my "motorcycle tan" is usually just a tan circle at my wrists. I usually wear a long sleeve t-shirt and pull the sleeves down into my gloves. The gloves are secured with a Velcro strap so all that gets sun is the small circle between glove and strap. We call it "Mickey Mouse Hands".
I mostly stay fully covered - including gloves and a big hat - in the middle of the day, but get a little sun here and there, mostly naked. I wouldn't dream of stranding myself on a sunny beach between about 10 in the morning and 3 in the afternoon. I lack the patience or the will to lie still working on the color of my skin; I'm a little tan on my shoulders and back. So no tan lines, but no all-over tan, either.