My hub gets off on being the small dick cuck and being submissive to my lovers so there have been a number of embarrassing orgasms for him over the years. Two stand out in particular.
The first was when we were new to the lifestyle and we were at a party that was a few white couples and a number of black men. As we were new to this and hubby is a very masculine looking guy, one of the guys thought it would be a good idea to make my hubby wear my panties while I was playing. He looked silly and was visibly embarrassed, but his little dick was rock hard the entire time. At the end of the party every one was standing around and getting dressed, I told hubby to give me my panties back. As soon as he slid them down over his raging hard on he made a face and started cumming right there in front of everyone without anything other than the fabric of my panties having touched his dick. Needless to say there were a number of laughs and hubby was quite embarrassed.
The other time was when we were with a very dominant bull who liked to fuck us both. The second time he fucked my hubby, my hubby came just from getting fucked in the ass. This was very humiliating for him at the time as our bull took it as a sign that my hubby was a "little faggot bitch". Hub was embarrassed because he came so easily and also mentally scarred for a while after wondering if he was really gay (which he is not!). He was still new to his role as a submissive cuck then, but now he understands his role alot better and knows his submission to other men is a sign of his weakness rather than a choice on his part.