i actually see on a regular basis a chap for no strings fun, we ve been seeing each other for 7 years, during which time he had 2 or 3 girlfriends and then finally met and moved in with his partner. All this time he also saw me.................
Not one of them ever found out about me so i assume he is a good liar or that the "signs" as someone said arent as easy to see if you arent looking for them.
i like the arrangement, i enjoy living alone, dont particularly want a partner but like the regular sex and the support he does give me. I certainly never wanted him to be my boyfriend ( even when between girlfriends ).
so from personal experience, i feel it must be possible to have 2 people in your life as long as the "other" one ie not your "dull" one , never wants anything else, is incredibly discreet ( like me ) and never wants any more than you are prepared to offer ( like me ) and certainly doesnt want to rock the boat ( like me !!!)