On a recent afternoon, Doctors Without Borders discharged from a clinic in Monrovia five men and women who had survived Ebola, reminding them as they left to use a condom. None of their spouses were present.

Other clinics have issued survivors with a certificates that cautions them, in large letters, against having sex for 90 days. It doesn’t always work.

When a Liberian clinic released Nathaniel McGill ’s fiancée of two years, he put his arm around her and announced they would get married right away.

“We have to make it immediately,” he said, laughing. “I’ll be very careful, be sure of that.”