The flat iron is a sexual position in which one partner lies face down, flat on their stomach with their legs together, while the other partner lies on top of them, also facing downward, and enters from behind. The receiving partner's legs remain closed throughout, which creates a tighter fit and a different angle of penetration compared to more open-leg rear-entry positions. The name references the flat, pressed-together shape both bodies form. The position works for penile-vaginal or penile-anal penetration, and can also be adapted for strap-on use. Because the receiving partner is largely pinned beneath the active partner's body weight, movement is mostly controlled by the person on top. This positional dynamic tends to feel more passive for the person on the bottom and more physically dominant for the person on top. It is considered an intermediate position in terms of flexibility demands, requiring less range of motion than many rear-entry variants, and is accessible to most adults regardless of experience level.
In practice, the receiving partner lies prone, legs together, arms resting wherever is comfortable, often extended forward or tucked under a pillow. The giving partner straddles the back of their thighs and lowers their body over them, entering from behind. The closed-leg position creates noticeable physical differences compared to doggy style or other open-leg rear-entry positions: the fit feels tighter for the giving partner, and the angle of penetration shifts slightly downward, which can stimulate different internal areas for the receiving partner. Depth and rhythm are largely set by the person on top, making the dynamic feel naturally weighted toward one partner guiding the experience. Some couples place a pillow under the receiving partner's hips to adjust the angle of entry. Others use the position specifically for the skin-to-skin full-body contact it provides, since almost the entire front of one body is pressed against the back of the other. What draws people to it varies: some value the physical sensation differences, some enjoy the intimacy of full-body contact, and others are drawn to the implicit power dynamic that comes with one partner being pinned and largely still. It can be adapted to slow, grinding movement or faster rhythm depending on preference.
Communication before and during is important, especially because the person on the bottom has limited mobility and may feel the full weight of their partner. Agree on a clear verbal or physical signal to pause or stop, since tapping out may be difficult with arms pinned. The partner on top should support some of their own body weight on their arms or knees to avoid uncomfortable pressure on the spine or ribs of the person beneath them. Check in regularly, as the pinned position can restrict breathing if weight is not managed carefully. People with back, hip, or respiratory sensitivities should discuss modifications in advance.
Most people find it comfortable as long as the partner on top is not resting their full body weight on them. Placing a pillow under the hips can reduce pressure on the pelvis and improve the angle. People with lower back sensitivity or breathing concerns should communicate this before trying.
In doggy style the receiving partner is on hands and knees with legs apart, which allows the partner behind them to thrust with greater range of motion. In the flat iron the receiver is face down with legs closed, restricting movement for both partners and changing the penetration angle and tightness.
Yes, the position is accessible to a wide range of body types. Height and weight differences between partners may require adjustments like added pillows or modified arm placement, but there is no standard body requirement for the position to work.
The position naturally limits the bottom partner's movement and gives the top partner most of the control, which some people interpret as a light dominance dynamic. However, many couples use it with no power-exchange intent and simply enjoy the physical sensations. The dynamic is whatever both partners decide it means.
Because movement is restricted, some receiving partners use subtle hip tilts or squeeze their thighs together to vary sensation. A vibrator placed underneath the body before the partner lies on top is also a common addition. Communicating with the giving partner about pace and pressure is the most direct way to shape the experience.
The main physical risks are breathing restriction if the top partner lies too heavily on the bottom partner's back, and discomfort in the lower spine or hips if the angle is awkward. These are easily managed with a pillow under the hips and by the giving partner keeping weight on their arms. A clear stop signal agreed upon in advance addresses any concern about the bottom partner being unable to communicate discomfort quickly.
Reviewed by Reviewed by the Jar of Kinks editorial team