There are several reasons why someone might choose to use a G-spot or P-spot dildo:

1. Increased pleasure: For many people, stimulating the G-spot or P-spot can provide intense pleasure and even lead to more intense and pleasurable orgasms.
2. Exploration: Using G-spot or P-spot dildos can be a way to explore and discover new erogenous zones and types of sexual stimulation.
3. Solo or partnered play: G-spot and P-spot dildos can be used for solo play or with a partner, and they can be a great way to enhance sexual experiences with a partner.
4. Health benefits: G-spot or P-spot stimulation can provide health benefits for some people. For example, prostate massage can help improve prostate health and reduce the risk of prostate-related health issues.
5. Diversity in sexual experience: G-spot and P-spot dildos can be a way to diversify your sexual experiences and add variety to your masturbation or partnered sex.

Ultimately, deciding to use a G-spot or P-spot dildo will depend on individual preferences and desires. However, for those who are interested in exploring these erogenous zones, these types of dildos can provide a way to enhance sexual pleasure and discover new aspects of their sexuality.