One explanation.
She allows him to do anything he wants so long as he doesn’t bug her for sex.
Here are some quotes from a Daily Mail article.
“The decision was made to have Camille handle professional as well as personal finances. Instead of carrying credit cards, Cosby carried rolls of hundred dollar bills or ‘let business associates pick up his restaurant and travel expenses’.”
“At age forty in 1977, Cosby told Camille he was going to cut back on his playboy ways and devote himself to his loving wife and their children.”