Trying to date while being an active triathlete is hard.
If you manage to land a date with a "regular" (AKA - non-athlete) person (why would you want to do this anyways?!), prepared to be blown off due to having an "extreme" lifestyle. Your personality might be great, but you are crazy for riding your bike for 3 hours, because who would ever want to do that?! Isn't it cooler to eat nachos while sitting on the couch?
If you try to date someone who is a single sport person (runner, or swimmer, or cyclist) it will work out for a while, but then you will convince them to try a triathlon because you are super awesome, and then you will beat them (since you are seasoned), and if you are a woman.. well they won't like that!
If you actually manage to meet another triathlete (bonus if they are rich) - great! But if you're both Ironman triathletes.. prepare to never see each other because you are both on your respective 6 hour rides that are probably conflicting since you can't ride together due to gender/speed discrepancies.
This is why I have a cat. :)