Thanks so much!

Thursday supposedly has to do with how men's and women's body chemistry fluctuates throughout the month. Apparently, the body chemistry matches up best on Thursdays.

As for Sunday mornings, your guess is as good as mine. My theory is that it has to do with relaxation, time availability, and how time zones work over the world. Probably it's really a set of hours between Saturday late night and early Sunday morning, meaning that lots of people have sex in that timeframe—a popular night to go out, have drinks, date, etc.

Those are my thoughts anyway!