Are you in a relationship? If so, this is fantastic. Even more beautiful would be if this relationship would be very passionate. Lost passion in your bedroom? Let's take things in turn ...

Dr. Justin Lehmiller organized a study of 40,000 people and managed to find out what are the 5 big differences between couples who always have a hot and passionate sex life and those whose passion has long since faded.

Those who continue to keep the passion alive in bed are likely to do these five very important things:

1. Spend more time preparing to have fun.

2. Practice sexual communication, so talk to each other about sex.

3. Practice oral sex.

4. They are happier with their relationship in general.

5. Practice changes in sexual intercourse.

Dr. Lehmiller explains that couples tend to get bored of the sex routine, but it is the changes that rekindle interest in sex. The key to all of this lies in a substance called dopamine. Dopamine is a neurotransmitter that is directly linked to the pleasure center in the brain. It is the substance that makes us feel good. She is teased by the changes or innovations that occur, so try to be creative when it comes to passion in the couple.