All good tips (for the guys). I was in the online dating world a little too long and can say all these are accurate. I played around with my profile a lot to see what worked and what didn't. Adding a shirtless picture (not a selfie) tripled my number of matches. disclaimer: results may vary, I was in excellent shape at that time.

However, then, for my highly-scientific study, I added a shirtless bathroom selfie and my number of matches plummeted.