Let Learn Some From This:

WHAT IS SEX OR SEXUAL INTERCOURSE
  Sexual intercourse , or coitus or copulation , is principally the insertion and thrusting of the penis, usually when erect , into the vagina for sexual pleasure , reproduction, or both.
    This is also known as vaginal intercourse or vaginal sex .
Other forms of penetrative sexual intercourse includes:
*Anal sex (penetration of the anus by the penis)
*Oral sex (penetration of the mouth by the penis or oral of the female or male genitalia )
*Fingering (sexual penetration by the fingers)
*Penetration by use of a dildo (sex toy)
                           FOREPLAY
  In human sexual behavior : Foreplay is a set of emotionally and physically intimate acts between two or more people meant to create sexual arousal and desire for sexual activity.   Either or any of the sexual partners may indicate sexual interest to initiate foreplay, and the initiator may not be the active partner during the sexual activity.
   Foreplay stimulates both partners' sexuality, lowers inhibitions and increases emotional intimacy between partners, and implies a certain level of confidence and trust between the partners.

Tantric
Tantric foreplay is the first step in the lovemaking session, according to the tantra principles. Tantric sex is against rushing things for the purpose of reaching an orgasm, so tantric foreplay is a way to prepare the body and the mind for the union between the two bodies and the universe. The tantric rules say that foreplay must be focused on the preparation before sexual intercourse. Tantric foreplay may include sensual baths between the two partners in a relaxing atmosphere. Fragrance oil and candles may also be used to set up the mood.
    Tantric foreplay is only about giving each other time to connect spiritually and bind. Staring at each other while in a cross-legged position and touching the other's hand palms is a usual foreplay tactic used by tantra practitioners. Tantric foreplay may also include massages. The massage that is applied, according to the tantric philosophy, is not for reaching orgasms but for giving each other pleasure and connecting at a spiritual level.

Foreplay can begin with one person indicating in some manner to another person a desire to engage in sexual activity with that other person.
    Any act that creates and enhances sexual desire , interest, stimulation or arousal in a sexual partner may constitute foreplay.     An indication of sexual desire can be through physical intimacy, such as:
Kssing
Touching
Embracing or Nibbling the partner.
Mental engagement can also create sexual interest, such as
Flirting
Talking
Whispering
Teasing
   It may for example, be a non-physical gesture that indicates sexual availability.
  Sexual interest can be indicated and created by
Nudity such as by one partner stripping
Wearing sexually suggestive clothing
Creating a romantic Intimate Overtly sexual atmosphere.
 
 The manual or oral touching of an erogenous zone may indicate sexual interest, as does an intimate kiss on the Mouth
Breasts,
Stomach
Buttocks
Back
Inner thighs or other areas of the body.
  A passionate or French kiss commonly indicates sexual interest,  as does any removal of a partner's clothing.
Verbally, foreplay may include compliments, subtle comments with double entendre, and intimate conversations.
   Non-verbally, foreplay can include provocative clothing, suggestive postures and motions,
preening gestures, winking, licking or biting one's lips, standing inside a partner's personal space , and holding a gaze longer than would be expected from only a casual interest.
Foreplay commences when the other partner indicates reciprocal sexual interest. Depending on the context, the non-objection to a partner's advances may indicate that the sexual interest is reciprocated, as may a response to a kiss or hug. The non-objection to the touching of an erogenous zone, or the taking off of an item of clothing may indicate reciprocated sexual interest. Also, the other partner may indicate reciprocal interest by engaging in intimate behaviour of their own.
There are situations which act as turn-offs or which can affect the romantic or erotic moment that may have been created.
               
 SEX TURN OFFS YOU NEED TO KNOW
These can range from things like bad breath, body odor, excessive noise or a reference to an ex-partner. A person's sexual inhibition can also impact on creation or maintenance of sexual interest.