My take: The author maybe thinks she might feel shame about some of her past sexual partners; maybe he feels shame about some of his and believes given enough

My take: The author maybe thinks she might feel shame about some of her past sexual partners; maybe he feels shame about some of his and believes given enough time everyone has shame about a sexual partner or two, for whatever reason. The other option is the author thinks that she believes the author will see her in a negative light for some of her past sexual partners, for whatever reason, so she will not mention the ones that show her in a bad light.