Women who have sex with women contact with cervical secretions, vaginal mucosa, or menstrual blood, including fingers or penetrative objects may transmit sexually transmitted diseases. Oral-genital contact may indicate a higher risk of acquiring HSV, even among women who have had no prior sex with men. Bacterial vaginosis occurs more often in lesbians, but it is unclear if BV is transmitted by sexual contact; it occurs in celibate as well as sexually active women. BV often occurs in both partners in a lesbian relationship; a recent study of women with BV found that 81% had partners with BV. Lesbians are not included in a category of
Lymph hearts pumps lymph into the jugular vein. The other pair at the end of the vertebral column pump lymph into the iliac vein in the legs. "Rana catesbiana" and "Rana nigromaculata" have mast cells in the lymphatics of the tongue. These are round and in the monocellular layer of the lymphatic walls either in close adhesion or in contact with the cytoplasmic process. The lymph hearts rhythmically and slowly pump to drive the lymph into the veins. It is possible to see the lymph hearts beat by looking on the dorsal surface on either side of the urostyle. In the toad