John Wesley on Genesis 38:14

Some excuse this by suggesting that she believed the promise made to Abraham and his seed, particularly that of the Messiah, and that she was therefore desirous to have a child by one of that family, that she might have the honour, or at least stand fair for the honour of being the mother of the Messiah. She covered her with a veil - It was the custom of harlots in those times to cover their faces, that tho' they were not ashamed, yet they might seem to be so: the sin of uncleanness did not then go so bare - faced as it now doth.