Kinda sounds like flirting. Have you let them know you're not interested?

Why is it on the inside lip? Wheel have provisions for either side?

A lot of times this can just be from dust buildup on/around that nozzle (I'm almost sure that's not the proper terminology tho). An easy thing to try is shutting off the gas to the insert and taking a can of compressed air to that nozzle and everything around it. If you can easily take off the panel in front of it, even better, spray all the dust out you can.

Is this dangerous?

The hissing noise is not. Turning your pilot knob to some in-between setting is.

How is that different from trap and release programs?

It's not, I volunteer for those too. This is just on my dime.

Personally, I have no qualms neutering any untagged/unchipped cats that start hanging around. At best it's providing a community service. At worst, I'm encroaching on some unknown neighbor's "freedom" to let their pets run wild and free. But mostly it's because it helps keep my inside cats calmer.

Larry looks like he's doing ok. I wouldn't have any immediate concerns about his diet.

Edit: is that a bed of catnip/cat mint?

youtube.com/@MAGYARBIRDS if you need more orcs being turned into fertilizer for sunflowers.

Hell, he even let Vince McMahon sire Don Jr.

If it's not out in the yard in front of god and the neighbors; yes,

I toss mine down for garden edging until I need them for something else.

Takes a lot of practice to let the index finger go limp while gripping with the other two.

And also not grip it tight enough it pops the lid off and contaminates the entire pizza topping table with Copenhagen™

I can dislocate my arm/shoulder joint at will. It was cool as a kid; I could pull them far enough out of the joint to pinch my fingers around the collarbone. I still probably could, but now I'm old and haven't hit my insurance deductible for the year, so not gonna try.