Stout halflings are openly reputed to have dwarvish ancestry, whilst the now-forgotten Tallfellow halflings were implied to have similar lineage connections to elves. To this end, D&D recognizes this by the existence of races like the Half-Elf and Half-Orc, the tiefling/aasimar/genasi trinity, and more besides. Xenophilia is literally one of humanity's oldest fetishes, to the point that there are Stone Age cave paintings depicting humans having sex with animals, and the D&D worlds are ones filled with many exotic creatures that have human level (or better!) intelligence. I know that this is a bit of a taboo subject, but hopefully it's not an NSFW one.
