Getting naughty under the sheets as well as remaining emotionally attached to romantic partners in old age may not be linked to decline in memory skills finds a study. Although lifestyle factors level of education smoking and drinking habits and physical activity all play a role in the rate and extent of age-related cognitive decline the study now shows that there is no link between sexual activity and rate of cognitive decline. Decline in memory performance over time was unrelated to sexual activity or emotional closeness during partnered sexual activity said Mark Allen of the University of Wollongong in Australia.