Smart-alec replies might be listed as:
A) Anything BUT the voice of YOUR "ex" and/or the "action" of a 12-gauge...
B) Not as long as you're still breathing...
C) Let him know the test results were negative and/or that your kids are with your "ex" for the evening...
More seriously (sorry, I couldn't resist)...
A) Any NON-FAKE sound of immense PLEASURE... ie... "sincere moaning" and beyond !!!
B) Feedback is nice, but moaning gets the message across (see part "A", above)... Discussion of recombinent DNA research might be best post-poned...
C) Sincere feedback indicating that HE is contributing to YOUR pleasure INTENSELY !!! Don't embellish or compare him to a gorilla (which are minutely endowed, by the way)...
That's it, I hope you got a chuckle, along with some very "sincere feedback" (although they do restrict actual moaning on these strands).
Ben There
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Am I here, yet ???