Sexual, since sexuality is an intrinsic part of human identity.
Adam and Eve had no interest in sex prior to the eating the apple.
Not true. God told them to be fruitful and multiply before the fall.
How can you say they were sexual before since Eve had no desire or capacity to bear children.
Your premise is incorrect. See above.
If they were sexual, it must have been for their pleasure only.
Sexual intercourse has two purposes: the reproductive and the unative, which includes pleasure. There is no reason to think this was any different before the Fall.
Proof that they were asexual. They did NOT go forth, be fruitful and multiply before the fall.
Adam didn't 'know' Eve and Eve didn't conceive till Genesis 4, AFTER they were kicked out of the garden.
Here is proof that Eve was asexual prior to the fall:
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Unto the woman he said, I will greatly multiply thy sorrow and thy conception; in sorrow thou shalt bring forth children; and thy desire [shall be] to thy husband, and he shall rule over thee.