Since there are no species on Earth with intelligence equal to or greater than humans, there's not really a term for it. It remain squarely in the realm of fiction."Bestiality" is sex with an animal, sex with a non-Human intelligent being would not be bestiality.
I could agree with that. Is there a more generic term for sex with another species?
If intelligence is required for acceptability of sexual relations, does that make intercourse with apes and dolphins and other terrestrial non-human intelligent species acceptable?