Posted in Business & Finance, Health & Medicine YFSI stands for Yearly Frequency of Sexual Intercourse YFSI stands for Yellow Freight Systems Incorporated YFSI Share Pinterest Tweet Whatsapp Post navigation YFSSYFSF Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment.