Cheating

A man is telling his friend about his escapades and says,

 "I feel so bad -- I've been cheating on my wife."

 "How many times?" asked the friend?

 "I mean, if this is your first time, surely you can beg for forgiveness. "

 "How should I know?" he replied. "I'm not an accountant, I'm a lover." 

Regards,
-Strider-