Sentence:  Some recent writings assume that the ignorant young couples are a thing of the remote , Victorian past ; that nowadays all honeymooners are thoroughly familiar with the best sex-manuals and <WSD>know</WSD> enough from talk with friends and personal experimentation to take all the anxiety and hazards out of the situation . 
Meaning of the word marked with <WSD> tags:  be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about