Why do men offer a casual relationship to a woman rather than a serious one?

Anonymous
Is this the sign of the times or is it usually in relation to how much a man sees a woman's worth? Their usual explanation for only offering casual sex is because they won't be ready for a couple of years. Or it simply an easy option. Little responsibility and can be with other one if they choose? Doesn't give women much security.
Why do men offer a casual relationship to a woman rather than a serious one?
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