masquerade
positivity
Yep, I agree with editic.
Many young men are like nymphs for several months/years into marriage until the reality of unrealized responsibility sets in defeating their mental stamina if they were not adequately prepared.
Many men also party hard and eat wrong until their body bloats and their minds fail... Then it is almost inevitable that the 'monster' they've created during their lustful years of youth would become too much.
Many women in their early 40's are like nymphs. ( uh hum ... clears throat )