Is it weird to cancel a date you know will end in sexy times if you're on the rag? 

In context, I've been seeing this guy for about a month and we sleep together every time we hang out and I really like spending time with him clothed too, but it's always awkward to me to broach the topic of periods, even generally, with guys (I know I shouldn't, be an adult, blah blah blah, it just seems like an intimate thing to discuss, imo), so I tend to just... avoid them... every 21 days... But I like him! And I still want to see him. I'm totally be ridiculous, I'm sure, but there you have it

Dude opinions appreciated.