It was just a matter of time (form Kotaku):
Japanese porn company Glay’z just announced that five of their quality flesh films are coming to the portable. The intriguingly titled The Nurse of a Big Breast will join Make a play of Riko Tachibana and Soap Play of Anna Kaneshiro in early July as the first releases. A few weeks later Premature flesh is the area which became wet hotly and Erotic Terrorist Beautiful Body Noa will hit the PSP.
A link to the company’s website.