Vehicle - usually symbolizes our passage through the journey of life. The way that you travel through your life's journey, and your effectiveness in controlling your life.
The type of vehicle will give indications of the type of experience being related in the dream message. For instance, an ambulance will indicate a need for healing in the giving and receiving of experience, a police car will signify the need for discipline in experiences, an old car might suggest old habits, or 'things the way they used to be' or the need to change the old way of doing things...etc.

Stairs - Going up and down the stairs could mean several different things. It could represent changes in consciousness, movement from one inner plane to another, or a change in understanding. In a more material sense, it could represent a rise or fall in economic or social status and the general efforts that are required to accomplish life's small and large goals. Climbing may represent an achievement of your ambitions and a movement in a positive direction. Descending may symbolize your doubts or a period following hard work and achievement of a significant goal. Generally, dreaming of ascending a stairway connotes movement in a positive direction while descending is indicative of a down period or negative flow of ideas or actions.

House - A house usually always represents you, or rather 'the self'...your body and the attributes of your personality.
They symbolize your emotional and psychological 'self'. All of your experiences, stages of development, and parts of your conscious and subconscious life may be represented by that house. The house may be representing issues concerning a particular dilemma in your life, or it may be more general and comprehensive.

Unknown house - suggests aspects of yourself you are not familiar with, and new experiences.

Kiss/Kissing - Depending on how the kiss makes you feel. If it left you with a positive feeling, it represents the acceptance of what, or who, is being kissed....or the acceptance of what or who they represent. Also, sexual agreement, tenderness, and movement towards unity.
If the kiss left you feeling sad, lonely, angry or any negative feeling, it represents a feeling loss, betrayal, or duplicity(as with Judas kissing Jesus). Idioms: kiss of life, kiss of death, kiss 'it' goodbye.

Sex - sexual dreams are not always about actual sex.
It may represent the finding of your Self through opening yourself.  A merging of energies, aspects or qualities within yourself, (a psychological completion and the integration of contrasting aspects of the 'Self') Sometimes, it is about how we perceive people and how we think others are perceiving us.
Alternatively, if having sex in a dream is a straightforward expression of sexual desire, it may be your libido's way of telling you that it's been too long since you have had sex. It may indicate repressed sexual desires and your needs for physical and emotional love.

Having sex with an ex, denotes your reservations about embarking in a new relationship or situation. You may feel nervous about exposing yourself or currently feel a resurgence of those old emotions and feelings that you felt back when you and your ex were together.
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Are you wishing you didn't move away?
Are you sort of wishing things were the way they used to be?
Do you feel worry that Andrew won't like you as much as you like him?

I hope I could help a little, good luck!