Kiss on the heart!!

A good tip:

When you are laying next to your guy/girl (on a bed or couch) gently rest your hand on their chest and kiss in the middle of their chest. It is an amazing feeling to be kissed right where your heart is! Girls will feel secure and safe with you.

Also, for girls:

When you are laying next to your boy (on a bed or couch) rest your ear on his chest and listen to his heart. It is a great feeling to hear his heart start beating quicker and he will fell safe and warm with you laying there.