S emen has a distinctive scent and if you can smell it on you, you can feel self conscious or anxious about others noticing. Some semen is thin and clear. In reality vaginas are an open canal, and semen can also seep out of your bum if someone came inside you during anal sex. Telegraph Lifestyle Women Sex. STIs can be passed on through oral, anal and genital contact. Petra Boynton is a social psychologist and sex researcher working in International Health Care and studying sex and relationships. Thank you for your support.