I agree there's a very sexual aspect to bondage, and I am one of those people who get seriously turned on by it. HOWEVER! That really depends on the circumstances and nature of the bondage. First of all, I can't be fully dressed. I'm much more like to get turned on if I'm tied up in my underpants or some sort of tight outfit (superhero? lol), but I can't be wearing my work/everyday clothes.

. I'm more likely to get turned on if I'm gagged with duct-tape, or blindfolded, or better - both! The way I'm tied is not even that important, as long as it's tight and inescapable. Poor TUG work that is easily escapable doesn't do anything for me.
Throw some naughtiness into the mix, and you got yourself an NC-17 movie.
Jason, your situation is unusual and interesting. You said that you were 40 and your partner 25, yet you were extremely bothered by the situation and stopped TUGs altogether. I don't necessarily think the age gap is such a big deal. Last year, when I was 23, I had a relationship with a much older man - he was +50. (Please try not to visualize this if you're easily disturbed lol). It was a wonderful relationship, I was not coerced, in fact I tried to get him to tie me up but he didn't enjoy it so much.

My view is this: I don't support doing ANYTHING sex-related with underage people, at all. And a few years ago, I was one of those underage boys who couldn't get a date (things changed!) and fantasized being picked up by someone older. Now I'm glad it hasn't happened hehehehe. As long as your partner is an adult (I'm not even going to say "legal", because lots of 18 year olds and ESPECIALLY 16 year olds, even more so if they're boys, are naive and haven't lived enough to make an informed decision regarding certain things) and there's no physical coercion involved, I don't see what's so bothersome about it. Did your partner enjoy himself, or was it an awkward experience? That could definitely be a factor. There are LOTS of guys in their 20's and 30's who are either straight, gay or bisexual who probably wouldn't mind having TUGs with an older guy. You're going to have to find someone who's nice to you, and respectful, and if possible, is good looking and athletic. Like...me for example

. Too bad I live in Ontario lol.
Sorry I can't talk now, I'm a little tied up at the moment.