CUMGRAVY

What causes weak erections?
Weak erections are often down to a lack of blood flow to the penis. They’re also known as erectile dysfunction (ED) and it refers to when you're only able to get an erection sometimes, when you can get one but it doesn't last long or when you can't get hard at all. 

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Why do I have a firm erection when I masturbate but not with a partner?
This is a common problem. It can come down to a few different reasons, one of which is that sex with a partner may not ‘match up’ to masturbation.
For example, sexual activity with a partner might not be as aggressive or put as much pressure on your penis as when you use your hand. This can lead to delayed ejaculation, where you take a long time to come or don’t come at all.