It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that Ma'iz bin Malik (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said to him: "Perhaps you only kissed, or touched, or squeezed?" He said: No. He (peace and blessings be upon him) said: "Did you do such and such?" (in plain words, without any euphemism). He said: Yes. So he (peace and blessings be upon him) ordered that he be stoned.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11886