If I am planning on sex, I stop eating several hours before bottoming, and douche at least 30 mins, normally an hour, beforehand. Because of this, morning sex is more convenient for me (I can go to the bathroom and douche, then sex, all before breakfast.). Sex at night means I have to eat a larger lunch (to hit calorie and macros for the day) and then not eat in the evening to prepare for late night activities.
Douching is like any other bathroom activity, it just takes longer, so I'd want some privacy doing it. No one needs to see me bent over shooting water in my ass, trust me.
As a bottom, I'd want to have a discussion about planning the day's sexy activities because it would definitely help me plan and prepare. This would help avoid any unfortunate surprises.