Is it faux pas or taboo to go on a date with your sister in law (my brothers wife's sister)?

I was at the bar with some friends and started to talk to a gorgeous girl and we hit it off really well. We switched numbers and that was that. however, just like the plot of a cheesy movie, I meet my sister in laws sister for the first time.....it ends up being the girl I met at the bar. So is it wrong to date this girl now? Clearly I know that there is nothing biologically wrong with this but I was wondering if it is considered taboo or faux pas to do this...