Thanks to Julies book recommendation "Ashtanga Yoga as it is" by Matthew Sweeney in one of her posts, I know now that there is each Ashtanga sequence attached to a specific day.
In my case (as I'm only doing primary and intermediate series) this means:
Monday: 1st series
Tuesday: 2nd series
Wednesday: 1st series
Thursday: 2nd series
Friday: 1st series
Sunday: 2nd series
The goal is on Mo Advanced A, Tue Advanced B, Wed Advanced C, Thu Advanced D, Friday primary series, Saturday break, Sunday intermediate series.
And now it is also clear what is the best time for sex. It is on Friday evening, because there is a break on Saturday. This ensures that your sexual activities won't influence your practice in a bad way. Oh, I like this book very much.
It is something for hardcore Ashtanga practitioners.
It is my favourite Ashtanga book now. In addition Matthew is a very good-looking man.