Is there acausal sex? (Would that be, like, having (phone/cyber)sex with someone in a different Tegmark universe via some form of communication built on UDT acausal trade?)
If you’re basing the sex on acausal trade then you should perhaps refer to it as acausal prostitution. Or possibly acausal marriage.
If you’re basing the sex on acausal trade then you should perhaps refer to it as acausal prostitution. Or possibly acausal marriage.