I think jealousy can be both a natural reaction or a damaging emotion depending on the circumstances.
An example of where jealousy is a natural reaction is when a person finds out their spouse/partner has been having an affair. I think it would be somewhat strange if one didn't feel jealous in this situation (along with a whole myriad of other emotions).
However, jealousy can be damaging when its not backed by fact and purely due to suspicion of a loved ones affections/ behaviour. In this case its just possessiveness (as pointed out by Kelso).
As to whether its women or men that are more prone to jealousy....I think that totally depends on the individual.
"Don't be reckless with other people’s hearts. Don't put up with people who are reckless with yours"
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