Handsome. Double eyelids. High-bridged nose. Athletic. 165cm/55kg. DMs are welcome.

At a casual glance, the Twitter profile of Keita Yoshizawa, 34, might read like he is trying to land a relationship online. What he is soliciting, however, is not a romantic partner, but a recipient for his sperm.

On a recent chilly November evening, Yoshizawa (not his real name), having traveled all the way from his home in the Tohoku region, was waiting at a nondescript business hotel in Tokyo’s Ueno district for the arrival of a client he met on social media. This type of rendezvous is a common occurrence for Yoshizawa, but he largely keeps the meetings secret from those close to him.