For Followers Of Bloodhut, 'Thighs And Dolls' Is A Fond Reprise Of Old Stories.Bloodhut Productions reprises old favorites. By Dave Irwin AM I THE only person who thinks that menstruation is of questionable entertainment value? In a segment called "Aunt Flo' " in the latest Bloodhut Production Thighs and Dolls, the troupe's Annette Hillman presents a male audience member with a sanitary napkin for his comments. Describing her first menstrual period in detail, a member of the troupe fears that "I had pooped myself." There is also the description of an adolescent's understanding of sex: "A guy puts his peter into a woman's cootie," which