I don't believe that a fake OkCupid profile is professional misconduct but to suggest that your life outside of work is "your business" just isn't correct.
Well to be fair, as long as you're meeting new women you can take that to dating. Okcupid, tinder and approaching girls on the street or in stores are all the same thing: meeting new women. On my walk to the buses when I go to work I usually approach at least 1 girl. Or if an attractive girl is already at the bus stop that's even better. I supplement this by swiping through girls on tinder as I'm on the bus