Any electric razor whether it's made specifically for males, or females, MUST be cleaned after EVERY use just to maintain blade integrity, and sharpness. They all come with cleaning, and regular maintenance instructions. Simply follow them. That alone will improve the quality and ease of shaving, especially if one shaves pubic hairs regularly like every two to three days. Also using a moisturizer for sensitive skin is highly recommended between shaves.
It's no wonder he gets nicks and cuts if he uses your shaver and neither of you cleans it properly after use. The blades have to be all gunked up with hair, and virtually useless, or ineffective. Also he may have to pre cut his hairs down to a stubble, being thicker and coarser, and use some type of lubricant like baby powder, not oils or lotions, unless he goes with a non electric shaver, which I recommend for guys anyway.
No I don't, never have, never will, shave my pubes. Not my thing, but the wife enjoyed me shaving her stuff though. That was back in the day as clippers are good enough for her now. We do not share blades.
https://www.bing.com/images/search?q...ay&FORM=IDMHDL
Google the many ways and tips to enhance your electric shaving experience since it is a personal thing and everyone is different. May be fun to try different products until you find one that fits you and he should do the same.
https://bellatory.com/hygiene-groomi...titals-for-Men
The Best Way to Shave Your Pubic Hair (Men) - wikiHow
AND
https://www.liveabout.com/how-to-sha...tation-1717025
Can a lady shaver be used by a male for pube-shave?
I do not recommend it, as there are MUCH better ways for guys to shave their pubes, in my opinion.