Spouse crossing a hard boundary?

I (mid 30s male) and my wife (mid 30s female) have been together 10+ years. We have kids and on paper we have a very good life financially/etc.

However, one thing has been coming up the last year repeatedly that we haven't dealt with in like ~10 years... my wife has begun to do solo travel while I stay home with the kids. This is for fitness competitions that go all across the world. To be clear, I don't really have any problem with this at all aside from the fact that it's kind of unsafe for a very attractive woman to travel entirely alone to these venues where there's nobody who knows her exact location/etc... not to mention the cost of doing this 3-5x a year.

With that being said, it is not really something I have a big problem with so long as she stays safe and communicates... BUT the boundary she keeps crossing is traveling with men and meeting men in these locations. Her sport has options to compete with same gender OR opposite genders. She continues to choose to do this with opposite gender instead of same gender or solo competitions. I've said repeatedly that it makes me very uncomfortable that she does that when I am not there OR at close family friend isn't there. First, it's extremely unsafe to meet random men from the internet ANYWHERE but even more so across the country/world when they know you don't have anybody there... but also it just opens the door to temptation and "accidents".

Am I crazy here? She's done it in the past once and TRIED to do it a second time already before I told her again that it makes me extremely uncomfortable... but she has plans to continue to do this and does not seem to respect this simple boundary I have requested?