For example, if you let your partner have sex with others, but for them to be only be romantically involved with you(say). Or, it's quite possible to find other asexuals(though, if you're already in a relationship, that doesn't help). Or, how about nudes(like, being sexual without the sexual parts?)? The point really is to discuss it, that it doesn't need to be a deal breaker. If none of the options are viable, then sure, but it's like I can't have sex so no relationships for me.