I have heard that a woman’s breast size increases when she is sexually aroused. Is this true?
Yes – but not enough for you to notice. When human beings (that means men, too) become sexually aroused, heart rate increases and so does blood flow to various tissues throughout the body.
Blood flow increases to the genitals, for example, which helps with penile erections and vaginal lubrication. Blood flow also increases to the breast and chest area which can lead to “sex flush” in some people, particularly fairer skinned people, in which red spotty areas are noticeable on the chest.
The breasts can also swell slightly with arousal, but the key word is “slightly.” You should not be policing women’s bodies to see whether their breasts are ever so slightly fuller as a means of figuring out whether they’re feeling aroused.
A more reliable cue of a woman’s arousal is likely to be whether she is kissing you with passion or intensity or saying how much she likes or loves or wants you, or noticeable vaginal wetness.
It’s Better To Ask
All that said, arousal does not equal consent and I cannot stress that enough. Some people mistakenly look for signs of arousal as if those signs can tell a person whether or not their partner wants to have sex with them. And that’s just not the case.
Even among highly sexually satisfied and sexually active couples, there are (many) times when a person may feel aroused or turned on but not feel like having sex. Maybe they don’t want to have sex because they’re tired or mad or short on time. They might not also want to have sex if they’re not feeling ready or like this is a person they have a future with, either short or long term.
It can’t be said enough times: the best way to tell if someone wants to have sex with you, regardless of their gender, is to ask them.