OP I would very much appreciate if you could, possibly, bugger off into your fabulous, oh so smug, look at me I can still shag why cant you lot world!
Everyone is different, but hold on....after cleaning, shopping, rubbish tip runs, school runs, velcro baby, needy toddler, homework with the older ones, tea time, ironing school clothes, dishes, bedtime routines, fitting in mumsnet time I shall release my inner vixen and drape myself seductively across my sofa (co-sleeping) and fit in a quick shag 
as a disclaimer, seductively draping myself across my sofa for a quick shag roughly translates to falling into bed shattered whilst quite possibly drooling into my pillow.
Stop being so judgemental...sometime life gets in the way, people being holier than thou does not help.