Some global stats:

• The WHO: over 1 million STIs (sexually transmitted infections) are contracted daily by people all over the world.
• In 2017, nearly 36.9 million people were living with HIV/AIDS.  
• There are 30 known bacteria and other pathogens that are sexually transmitted.
• 8 STIs:
• 4 are curable: chlamydia, gonorrhoea, syphilis, and trichomoniasis
• 4 are incurable: human papillomavirus (HPV), hepatitis B, HIV, and herpes simplex virus (HSV).
• Over 291 million women are living with HPV, while the number of people who have HSV (herpes) exceeds 500 million globally.  
• It has been estimated that 357 million new infections of STIs occur annually.

Fact 1

The only contraceptive that can protect you from STI is a condom.

Fact 2

Only 2 contraceptive methods can protect you 100% from pregnancy: abstinence (decision to have no sex at all) and sterilization (a surgery that implies cutting or blocking the fallopian tubes).

Fact 3

There are over 18 birth control methods that can protect you from an unwanted pregnancy.

Fact 4

Sperm can travel up to 5 mm per minute, which, if scaled up to size, would be equivalent to a whale swimming 15,000 miles per hour or a salmon swimming 500 miles per hour. During ejaculation, the sperm is even faster, coming at a reported 28 miles per hour. This again proves that pulling out is very ineffective as a birth control method.

Fact 5

Frequent penetrative sex can help improve a woman’s cognitive function and memory by increasing the blood flow to the hippocampal region of the brain. The same though can be accomplished via any aerobic activity.

Sources:

Sexually transmitted infections (STIs), The World Health Organization

How fast do sperm swim and how do they find the egg? thenakedscientists.com