Is it hard to change from a kind of playboy to a nice guy?

Do those who have tried find it hard to break their habits and do girls find it less sexy when they become a nice guy?

Also, for girls is it difficult for a play-girl to become a nice girl, to leave behind the party, flirty kind of lifestyle... and do guys find this less sexy?
Is it hard to change from a kind of playboy to a nice guy?
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