Behold now, I have two daughters who have not known a man. Let me bring them out to you, and do to them whatever is good in your eyes. Only do not do anything to these men, because they have come under the shadow of my roof.”
“not known a man.” Idiomatic: have not had sexual relations with a man. See commentary on Genesis 19:5.
“what is good in your eyes.” An idiomatic phrase meaning whatever seems good to you.