As a paraphilia , breast fetishism also known as mastofact , breast partialism , or mazophilia  is a highly atypical sexual interest consisting of an exclusive focus on female breasts , which is a type of partialism. Scientists hypothesize that non-paraphilic sexual attraction to breasts is the result of their function as a secondary sex characteristic. The breasts play roles in both sexual pleasure and reproduction. Some authors have discussed the modern widespread fascination with breasts among heterosexual males in Western societies, especially in the United States , within the context of sexual fetishism. Scientists hypothesize that non- paraphilic sexual attraction to breasts is the result of their function as a secondary sex characteristic. Zoologist and ethologist Desmond Morris theorizes that cleavage is a sexual signal that imitates the image of the cleft between the buttocks , which according to Morris in The Naked Ape is also unique to humans, other primates as a rule having much flatter buttocks. Sexual attraction to breasts is considered normal unless it is exclusive and is therefore a form of partialism. There is a widespread fascination with women's breasts, and especially their size. Modern female fashions which focus on tight clothing and the display of cleavage have been attributed to an increase in breast fetishism.
Boob sex is pretty much what it sounds like.
You might think that only a spoiled-rotten dude, bored of blow jobs, vaginal, and possibly even anal sex, would want to put titty-fucking on the menu. A guy's not the Veruca Salt of intercourse — or insulting your other sexual routines — just because he wants to have sex with your boobs. He loves your boobs, and you hopefully love your boobs, and together your love will nurture your boobs until they get into a top-tier college and graduate summa cum laude. Or, at the very least, be the hot dog bun for his hot dog. No boobs are too small. You might be a member of the Itty Bitty Titty Committee, but as a lifelong card-carrier I can tell you that when there's a will, there's a way — although, admittedly, pushing them together does tend to be a bit painful. At first, you might feel like a doofus, but once you see he's getting off on it, you'll start to feel like a Powerful Woman Made of Breasts and Magic. There are two primary positions, depending on your cup size.
The fetishization of female breasts
Breasts are everywhere. But at the same time, women are also told to hide their breasts. Dress codes that permit men to wear revealing tops or no tops at all often prohibit women from showing cleavage. Breastfeeding mothers are told to cover up in restaurants for being inappropriate. Female nipples are banned on Instagram, while male nipples are allowed. People get titillated by breasts and enjoy looking at them or masturbating to them, but they simultaneously scowl at the women whom these breasts belong to, deriding them as inappropriate or pathetic and telling them to put their breasts away. In this twisted love-hate relationship that society has with female breasts, women are told that their breasts are valued and attractive, but also shameful and best covered up. We may think we have progressed enormously from the time when women had to cover their ankles in public, but it seems that not much has changed after all.
A key concern in feminist rhetoric has always been the unwarranted sexualization of breasts. They are believed to be sexualized without any fundamental basis in sexual activity, yet their representation in pop culture to satisfy the male fantasy has made them a mainstay in sexual rhetoric. But do breasts have a role in the sexual pleasure for those who have them? The sexualization of breasts, while off-putting for some, is also the reason why some women find their own breasts stimulating, both during and outside of sex.