And doxycycline is a PEP treatment, not a PrEP treatment; respectfully you should probably take a step back from conversations where you obviously aren’t informed about the basics.
Regarding PEP/PreP, Doxy has been researched and shown effective as PreP as well:
https://www.sciencedirect.com/science/article/pii/S120197122...
I have met doctors that recommended it to gay men, which is why I mentioned it.
Not speaking about LGBT related matters; Sex without condom is just like everything else - it depends on the person. For some people there is little to no difference. For others, wearing the condom removes all sensation, reducing the act to physical exercise. So is sex without condoms worth it? For some people, yes, it is.