Virginity is indeed one interpretation. I came up with several, some of which I had actually intended.

The thing is one has to be receptive in reading it. If you look closely, the word "her" has been bolded. This is to signify that the woman of subject is a strong woman. Boldness is strength. Strength of course can be good or bad. At the end of the poem the word sin not only is bolded, but also italicized and underlinged. This is to add emphasis on it as an important subject to the entirity. Strength of