Does 3somes cause a man to cheat?

My husband and i stay out on the road 2weeks at a time and on some weekends we decide to find a nice upscale hotel to relax at. During those relaxing moments we engage in 3somes with certain females who we both agree on and pick out together. He knws how i feel about other females i think its perfectly ok we are always together 24-7 day in day out ( hes a truckdriver and works for a great company) besides that im 27 and hes 33 i mean we share videos we find on the internet, pictures etc etc etc. We just like having fun and enjoying each other, im not a jealous person he knws i dnt play when it cmes to certain things in our marriage, he knws how far to go because he always makes sure he ask me before he does things. Im getting feedback and ive read certain things that do say 3somes do cause the man to cheat, im trying to figure out how? Why? and if im not helping the situation. MEN HELP ME OUT WITH THIS ONE.