No, oral stimulation by a partner cannot increase breast size
There is no medical evidence that sucking or oral stimulation from a partner can cause permanent breast enlargement in adults. This is a common misconception without scientific basis.
Why This Doesn't Work
The evidence provided relates entirely to neonatal pain management, breast implants, transgender hormone therapy, and pregnancy-related changes—none of which support partner stimulation causing breast growth 1, 2, 3, 4.
Breast size in adults is determined by:
- Genetic factors - the primary determinant of breast size
- Hormonal influences - estrogen and progesterone levels during puberty and hormonal cycles
- Body fat percentage - breasts contain significant adipose tissue
- Pregnancy and lactation - temporary enlargement due to hormonal changes and milk production 5
What Actually Changes Breast Size
Temporary Changes
- Menstrual cycle fluctuations - breasts may swell slightly due to hormonal changes, but this is temporary
- Weight gain - increases adipose tissue throughout the body, including breasts
- Pregnancy - causes significant but temporary enlargement due to hormonal preparation for lactation 5
Permanent Changes
- Surgical augmentation - breast implants remain the definitive method for permanent enlargement 1
- External tissue expansion - one study showed that wearing a vacuum-based brassiere device for 10-12 hours daily over 10 weeks produced an average 55% permanent increase in breast size through mechanical tissue expansion 6. However, this requires specialized equipment and prolonged daily use, not oral stimulation
- Gender-affirming hormone therapy - estrogen therapy in transgender women produces breast development over 2-3 years, with most achieving A to B cup sizes 1
Common Pitfalls
Do not confuse temporary engorgement with permanent growth. Stimulation may cause temporary swelling due to increased blood flow, but this resolves within hours and does not represent tissue growth 7.
Male breast tissue has erotic innervation but stimulation does not cause enlargement 7. The same applies to female breast tissue—nerve stimulation and tissue growth are separate processes.
The studies on breast stimulation in the evidence relate exclusively to inducing labor contractions in pregnant women, not breast enlargement 8.