[MF] lesbian craving dick for the first time

So my girlfriend and I have been dating for six years and within the last two years we stopped having sex… in that time I realized within myself that I crave dick and think about a man fulfilling that need which is something I’ve always been looking for.. I would love to have some guy have his way with her though, fuck her tight pussy while I watch. she’s always been into men but never pursued one either — help!! Should we have a threesome??