It may depend on your "audience". Please read some of Dolly's writings on cops. (If anyone has time to add some links that would be great!)
Men will not respond if they are not in the appropriate setting to do so. If you're slathering cops at church, for example (lol, not suggesting that you are, just as an extreme example).
Cops are best used in private, intimate settings. They are not advised for public use with random strangers such as bars, nightclubs, parties without a date/boyfriend.
Cops are to ENHANCE an existing relationship, not to ESTABLISH a new one.
just my .02