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Where to buy Chemistry Laboratory Materials ?

What is the best time of day or night for sex ? Some indulge after meals & before sleep when their stomachs are full or almost, some indulge just after awakening, some do it in the after boon, many indulge during mid night when awakened by chance. How good or bad does our hman body reacts to these timings ? Doex sex withown wife or stolen sex also has some differenbt effects on human body system ? Finally, what is the most common position for sex, and what is the best position for intercourse ? Does the female has always to lie beneath, and does women above give the gentler sex any psyhological boost ? How much to safely indulge for women and gents in sex between 20-30, 30-40, 40-50, 50-60, 60-70 and beyond ? Does sleeping after sex induces mental and physical satisfaction. Is their some tonic to induce sexual arousal in women ?