I have a very strange question. I am married for 18 years and feel my wife is not faithful. We usually do sex only once a month. Mostly she only decides it as all other times she says she is not interested in it. But even after so many days sometimes her vagina is tight and some times it's too loose that I loose interest mid way. Since I have doubts my mind goes to that side and I feel upset and rejected. Is loose vagina even after month without sex possible. When at other times it's tight. How's that possible if she is not having sex outside? Pl clarify.