Menstrual cycle Leggings - I Heart GutsIf you haven't been to our print-on-demand site lately, then you're missing out on some crazy new things, like these Good Ol' Menstrual Cycle leggings, now available to wear during your next cycle, menstrual or on your bike!

The cervix is generally described as “donut-shaped” but it in fact changes shape during ovulation, menstruation and of course childbirth! 🍩

Relaxin is a polypeptide hormone released by the corpus luteum (ovary), uterus, placenta and mammary gland. It plays an important role in pregnancy and childbirth, but there's still much mystery around the function of this multi-tasking hormone. Some of what we do know is that relaxin prevents uterine contractions early in pregnancy to avoid premature childbirth. During childbirth, it helps the cervix dilate and the vagina to soften and widen. In blood circulation, levels of relaxin rise after ovulation and lower again if pregnancy does not occur.  

Relaxin has also been discovered in men, although its function is even more unclear in men. Secreted by the prostate, it is found in semen. It is thought to assist the movement of sperm cells in the semen.

Recent findings show that relaxin also decreases tissue fibrosis in the heart, lungs, kidney and liver. It supports the growth of new blood vessels, helps heal wounds and is anti-inflammatory. Even though researchers are still figuring out what exactly it does, relaxin seems to be a pivotal hormone in various systems of the body, aside from just reproductive. Cool!

Vagina Lapel PinWhat do obstetricians Dr. Ernst Grafenberg and Dr. Alexander Skene have in common? Parts of the vagina are named after them! Here are all the biologically female parts named after men: 1. Fallopian Tubes are part of the uterus named after 16th century Italian anatomist Gabriele Fallopio; 2. The G-spot is a Bermuda Triangle-esque part of the vagina (it's existence is not proven + it may actually be part of the embedded clitoris and female prostate) named after 1900s physician Dr. Ernest Grafenberg: 3. Skene's Glands are located on the wall of the vagina, and are named for Dr. Alexander Skene, a 19th century gynecologist. The gland was renamed the female prostate in 2002. 4. Bartholin's Glands, which help lubricate the vagina, are named after Caspar Bartholin the Younger, a Danish anatomist who wrote about the glands in the 1600s. 5. Gartner's ducts get their name from Danish anatomist Hermann Treschow Gartner. 6. The Graffian Follicle is an ovarian follicle that secretes hormones that guide the menstrual cycle. Regnier de Graaf -- yet another Danish anatomist -- named this part in the 1600s. He also described the G-spot 300 years before Grafenberg (and a number of women surely discovered it ages before them). 7. Pouch of Douglas is the area between the uterus and rectum first described in the 1700s by Scottish anatomist Dr. James Douglas, who served as "Physician Extraordinary" to Queen Caroline. 8. Glands of Montgomery are the bumps on areola, men also have them, too, but these glands have different features in women due to estrogen. They are named for Irish obstetrician William Fetherstone Montgomery, who labeled them in the 1800s. 9. Hydati of Morgani are paratubal cysts in women, first described by Italian anatomist Giovanni Battista Morgani in the 1700s. You may wonder -- why? Well, back in anatomy's heyday, pretty much all doctors were men, so they were the first to write down the human body's many nooks and crannies. So even though a woman was 100% likely to be the first to learn about say, the so-called G-spot, from personal experience, she likely talked about it with her partner or friends as "that place that feels good" instead of putting her name on it or writing it down for the ages. There are of course tons of unisex body parts named after doctors, and plenty of biologically male parts, too: Sertoli cells are a helper cell for making sperm and check out the Cave of Retzius -- if you dare (NSFW depending on where you W)!