Drinking alcohol causes your inhibitions to be lowered. This means you are more likely to engage in behaviours you would not when sober. One in ten of boys and one in eight of girls aged 15-16 have engaged in unsafe sex whilst under the influence of alcohol. This can lead to an increased chance of getting an STI or an unwanted pregnancy. This can lead to feelings of regret the next day and cause low mood/anxiety.
Law in the UK states that anyone under the influence of drugs or alcohol cannot consent to sexual activity. One in five girls and one in ten boys aged 14-15 have gone further than they intended to with sexual activity whilst under the influence of alcohol. This can lead to being accused of, and in some cases charged with, sexual assault.