some likely did, but they can't again. the anuna (anunakki) manipulated human dna in the past and possibly interbred with us. they come from the pliedes and are the 'aryan' looking aliens. this race may or may not exist in corporeal form anymore, however. the 'greys' (your pic related) currently reside in the sirius direction, but are not native to that region. they seem to have the most active interest in humans, but i don't believe they have any interest in having sex with us.
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