First of all, even if they are desperate they wouldn't show that
they are interested .. to open and too many familiar faces in the
neighbourhoods, too many overly eager gossipers looking for a
chance to wag their idle tongues.
Secondly even if they were having affairs, not in the same house
and you wouldn't know it, see the first reason.
Thirdly these women if they are really housewives tends to follow a
daily pattern, wake up make breakfast, bring kids to school, go to
the market buy food, come home clean the house, run errands, maybe
walk the dog or cat in the afternoons meet neighbour for chit chat,
fetch the kids home make dinner.
If they miss the pattern every now and then it's ok but if too
often then it becomes obvious and people tends to take notice. It's
not possible to keep extra martial affairs under wraps for long
because things which supposed to follow a certain daily pattern
suddenly stop and too many excuses appearing, next thing you know
the spouse gets suspicious quarrels & fights erupt and tongues
start wagging.
sorry mate you have brilliant imagination but doesn't work that
way. 
