I’m dating and feel like a prude whenever I say no to sex

Most of the men I meet are upfront about what they want: sex. I never had a particularly high libido and feel like a prude whenever I say no. At the rate I’m going, I’m afraid I’ll end up single. What should I do?
Divorced men and women often feel awkward when they start out dating again. The thought of having sex with a new partner can be scary.