How does their intercourse look like? Did they experience any reward similar to orgasm during mating with females?

Better to the humanity as a whole. Regardless of their place of origin, valuable historical artefacts should be preserved and protected in stable, academia driven non-corrupt secure countries that are capable to ensure their maintenance.

We don’t want keep these artefacts in places where tomorrow a military junta or isis can overthrow the government and then sell to private collectors or even destroy these items. Better safe than sorry.