I don't really know where to start with this.
First of all, being bi doesn't mean that you can't be monogamous. You can be bisexual and only sleep with one person for your whole life, if you want. Or you can be a virgin, just like you can be straight or gay and be a virgin.
Even if you do have experience with both genders, that's not anything like "sleeping with everyone that is attractive." Having multiple partners over the course of one's life doesn't in any way imply having no standards of commitment. You can be bi, have experience with both, and not be a totally indiscriminate fucking machine.
And even if a person does have multiple partners in their life, if they want to "choose one person to love" they still can. It is possible to sleep around and then "settle down" and be monogamous. It is also possible to have a sexually open relationship and still only be in love with one person in a long-term committed relationship.
Honestly, though, I don't see what's so great about only loving one person.
D. and I do this kind of thing all the time. It's good fun.![]()