Don‘t know what a word means?
Then use our glossary to find out!
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Sanitary Towels
Sanitary towels are cotton pads that fit into a girl's underwear (knickers) when she is having her period. The towels soak up blood, but need to be changed every few hours.
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Scrotum
The bag of skin that contains a man's testicles.
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Semen
A fluid that contains a mixture of secretions from a boy's reproductive glands and sperm cells. Semen comes out from the boy's penis when he ejaculates.
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Sexism
The belief that one sex or gender is superior to another, or actions or attitudes that stereotype, prejudice or discriminate against people based solely on their perceived sex or gender.
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Sexual Actions
Having sex or doing things of a sexual nature with another person (like fingering or oral sex).
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Sexual Arousement
Also known as getting turned on or being horny. Something happens to make you feel in the mood for sex, you could be alone or with a partner when this occurs.
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Sexual Development
Also called puberty. The time when your body develops sexually.
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Sexual History
All the people you have had a sexual relationships with during your life.
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Sexual Intercourse
Sexual contact between two people, usually involving insertion of a man's erect penis into a woman's vagina.
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Sexual orientation
A person’s emotional, romantic and/or sexual attraction to another person.
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Sexually Transmitted Diseases
Infections that are passed on in sexual activity. There are up to 25 STIs, some of which are more common and dangerous than others. The best way to protect against them is to always use a condom. See our STI page for more information.
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Shag
Another name for having sex.
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Sheath
Another word for a condom.
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Shigella Bacteria
Usually caused by contaminated food but can also be caught through sexual activity that puts mouth in contact with faeces.
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Smear Test
A smear test (cervical screening) is a test to prevent cancer, by checking the health of your cervix. Cells are taken from a girl's cervix using a speculum (a small metal or plastic instrument), which goes inside the girl's vagina. The test isn't painful, but it might be a little uncomfortable. Females should have a test every three to five years from 25 to 64 years old and will be invited by a letter from the NHS.
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Smegma
The cheesy white substance produced by a gland under a boy's foreskin.
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Snog
To kiss and caress each other.
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Sperm
The reproductive seeds produced in a man's testicles.
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Squirting
See Ejaculate (female)
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Sterilisation
When a man or a woman has an operation to prevent getting pregnant or getting their partner pregnant.
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STI
Short for sexually transmitted infection. Infections that are passed on in sexual activity. There are up to 25 STIs, some of which are more common and dangerous than others. See our STI page for more information. The best way to protect against them is to always use a condom.
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Straight
Another word for heterosexual.
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Swab
A small piece of material or cotton that is used to take a sample of body fluid.
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Syphilis
A sexually transmitted infection, which may go unnoticed and can spread without either partner knowing. It is passed during sex or sexual activity and can be serious if left untreated.
If you still have unanswered questions, you can go to a service in your area for information & advice: