![How many people have you REALLY had SEX with? Online calculator takes internet by storm | Express.co.uk How many people have you REALLY had SEX with? Online calculator takes internet by storm | Express.co.uk](https://cdn.images.express.co.uk/img/dynamic/59/590x/secondary/Sexual-Health-Partners-Sex-Degrees-of-Separation-Online-Calculator-STI-Sex-Degrees-of-Separation-Online-Calculator-STI-Sexual-He-346989.jpg)
How many people have you REALLY had SEX with? Online calculator takes internet by storm | Express.co.uk
![University of Washington School of Public Health on Twitter: ".@uwdgh's David Katz, @uwepidemiology adjunct Steven Goodreau and other @UW researchers helped to develop this #STI prevention and risk calculator. Download the toolkit: University of Washington School of Public Health on Twitter: ".@uwdgh's David Katz, @uwepidemiology adjunct Steven Goodreau and other @UW researchers helped to develop this #STI prevention and risk calculator. Download the toolkit:](https://pbs.twimg.com/media/D70GLgJXsAAGw5L.png)
University of Washington School of Public Health on Twitter: ".@uwdgh's David Katz, @uwepidemiology adjunct Steven Goodreau and other @UW researchers helped to develop this #STI prevention and risk calculator. Download the toolkit:
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