Similar for zhan zhuang, they say no sex for first 100 days. Also, no sex for 3 hours before or after training as it interferes with the accumulation of 'jing', one of the three treasures.
I dunno though...you should also face East on certain days and certain seasons, etc, etc. We aren't monks living in caves our whole lives, some of it is just unrealistic to keep up, IMO.