This is very interesting and it sounds like you an many others only want to see the MC having sex. I'm curious about what you feel about the following scenario (which is currently planned):
This is a libido enhancement drug just about to be tested in human clinical trials. The MC attends one of the first trials as an observer for the company (this is a one time thing, not his normal duty as a scientist, sort of a momentous occasion resulting from his hard work). The trial occurs in a sex clinic and a positive outcome is if the trial participants - romantic couples who are complete strangers to the MC - engage in sex or not. Are you saying that you do not want to see 2 strangers having sex at all? That's easy to write into the script in a sensible manner (privacy concerns, etc.). Going even further, what if one of the female participants (again a stranger) over responds to the drug and becomes sex-crazed and meets up with the MC begging for dick? This would be a choice - it would be optional. Do you find that off-putting as well?
I'm very curious, thanks. I totally get being defensive with the main romantic interests and that has been the plan. Is it as simple as never show another person's penis, or is it do not allow any of the main characters (MC's or LI's) be involved with anyone else?