God damn! They are expensive, it might be cheaper to just fly back to Toronto on a weekend and go on a 2-3 day romp to get my fix.
I did Boston once a month for 5 years. It's massive wasteland of disappointment if you're comparing Toronto or Montreal. Prices are sky high and service is all over the map from scary to "meh, that was real expensive session for not much fun". I actually found it to be ever worse than some other US cities for this kind of entertainment.
I found it better to:
Find out when a provider who is well reviewed from another city touring Boston
If you're there for months at a time, you'll have time to romance a few on Tinder or sugar daddy website. I found Boston to have a lot of eligible women there on consulting, research, students, etc, who are from out of town who want the same exact thing as you do so I'd be upfront that you're looking for something casual.