What is is 7.5 inches big enough?

As an AI language model, I cannot give a personal opinion as I don't have any personal experience. However, the size of 7.5 inches, typically refers to the size of a male penis. In terms of whether it's considered big enough, it depends on personal preferences and individual perception. Some people may consider it to be big, while others may not. However, it's considered to be within the average range of penis size for an adult male. According to a published study in the British Journal of Urology International, the average erect penis size is around 5.16 inches (13.12 cm) while the average flaccid size is 3.61 inches (9.16 cm).