The breasts are external organs used for sexual pleasure in some cultures. Western culture is one of the few in which they are considered erotic.[8][page needed] The breasts are the subcutaneous tissues on the front thorax of the female body.[29] Breasts are modified sweat glands made up of fibrous tissues and fat that provide support and contain nerves, blood vessels and lymphatic vessels.[29] Their purpose is to provide milk to a developing infant. Breasts develop during puberty in response to an increase in estrogen. Each adult breast consists of 15 to 20 milk-producing mammary glands, irregularly shaped lobes that include alveolar glands and a lactiferous duct leading to the nipple. The lobes are separated by dense connective tissues that support the glands and attach them to the tissues on the underlying pectoral muscles.[29] Other connective tissue, which forms dense strands called suspensory ligaments, extends inward from the skin of the breast to the pectoral tissue to support the weight of the breast.[29] Heredity and the quantity of fatty tissue determine the size of the breasts.[8][page needed]
It's important to note that having sex can also promote a heart attack in those at risk, but having sex more often may help reduce this concern. While sex can precipitate a heart attack, and anyone at risk should talk to their doctor before having sex, a 2011 study published in JAMA, found that this risk is diminished in people who have high levels of regular sexual activity. In other words, and similar to other forms of physical activity such as running, infrequent activity could put a strain on the blood flow to the arteries supplying the heart, but regular activity may be protective.

Sexual behavior changes over time as a reflection of age, experience, and one's relationship. And the trajectory of change may vary between men and women. Women may encounter difficulties in navigating cultural attitudes about sexual behavior and promiscuity as they first explore their sexuality; age brings confidence and skill at communication that can enhance sex life. Young men often have concerns about performance, penis size, or premature ejaculation—and anxiety is no friend to performance for either men or women. Men often experience challenges with arousal and erectile dysfunction as they age. Couples tend to report that their sex life is most robust when they are in their 30s and 40s, but sex life is often most deeply rewarding for older partners. People can enjoy satisfying sex throughout the lifespan if they make adjustments for the many changes that time brings; that can mean relying less on penile penetration and more on massage, whole-body touching, and oral sex.

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