I don't ever recall seeing anything that says you shouldn't. I'd have to imagine if they thought it was a danger, they'd put that out in some kind of paperwork or something. Dolphins aren't like sharks where they'd swarm at the scent of blood. If it's a worry for you, I'd just double check all the fine print associated with DC and if you can't find anything, assume its fine. I'd obviously suggest a tampon and maybe just um..how do I put this...an extra cleaning prior to the swim?