In order to avoid the awkwardness of having to use a new girlfriend/boyfriend's bathroom after spending the night, one will fervently offer to run out and get breakfast. The point of which is to use the bathroom at Starbucks, McDonald's, etc.
"Hey hun, do you want me to go out and get us some breakfast?" breakfast emergency, please say yes!
"No, that's okay. I'm not very hungry."
"Are you sure? Breakfast is the most important meal of the day." oh shit! please say yes, please say yes
"No, I'm sure."
"But, if you don't eat you won't have any energy today."
Listen woman, you do not want me here in 5 minutes!!
"Alright, I'll be back in a few." Thank you Jesus!!