He spent 10 days in jail already? Wow, it is a suprise we are just hearing about this...
The jail term was 'stayed', meaning if he violates probation he goes in.
His jail time was waived.
The 10 days was "stayed" most likely "held" unless/until there was another related charge within the next year or some designated by the court time-frame. The fact that he pleaded guilty for this charge is the telling issue. He obviously felt culpable and believed he would have been convicted on the charge if it went to trial. While not compelled to do so he also would have had to testify in his own defense, and was reluctant to do so for whatever reasons. I can imagine the questions: "Have you ever had sex in a public restroom with another man?" etc.