I've never had a real issue crossing either the US or Canada borders either by bus, car or plane
Questioning at the airport seems to be the lightest especially with the kiosks now at YUL airport
As an American, more questions arise when entering Canada vs coming home
I often do get ask if I know...
My 2 cents: being addicted to porn is worst than SPs because 1) it's free and 2) it's easily available. With SPs you need to have the financial resources and make an effort time wise to arrange a meeting. No right answer, just my opinion