I am not aware of any downsides for a heterosexual male having multiple sexual partners, and I haven't found studies that really show any downsides.
However, when growing up in Highschool, I encouraged all my male friends to practice abstinence, unfortunately None of them listened to me.
A lot of them have trauma, and drama, and shit from their previous partners.
For me, I don't have that, I am care free in that regard.
I just haven't found the one (yet) 🤷♂️ but I'm almost thirty, and I have bigger problems on my plate.
Once I fix those issues then maybe I might date but who knows.