sow your wild oats
sow (one's) wild oats
To engage in rebelliousness or promiscuity, typically in one's youth before settling down. Bill and I had to break up because I was looking to get married, and he just wanted to sow his wild oats. You can't sow your wild oats forever! Soon, you'll want a wife and a house, and you'll regret the things you're doing now.
sow your wild oatsRUDE
If someone, especially a young man, sows their wild oats, they have many sexual relationships which are not serious and do not last long. This survey shows that men see nothing wrong in sowing their wild oats before settling down. To settle down with the first man you met means you haven't had a chance to sow your wild oats. Note: In this expression, the behaviour of young people is compared to someone sowing wild oats, which cannot be eaten, on good ground instead of edible oats.
sow your wild oatsgo through a period of wild or promiscuous behaviour while young.
Wild oats are weeds found in cornfields which resemble cultivated oats: spending time sowing them would be a foolish or useless activity. The expression has been current since the late 16th century; from the mid 16th to the early 17th century, wild oat was also used as a term for a dissolute young man.