Putting out quickly is a good way to secure the attention of a flighty man with options temporarily; but then you’ve gotta be extremely agreeable and integrate well into his lifestyle and be patient to see if he comes around to something long term.
Oh and calibrate your level of commitment to slightly below his, while remaining faithful, to give him incentive to chase.
While remaining monogamous.
So your reasons for withholding max commitment should be fear of getting hurt, to force him to qualify his feelings for your as sincerely deep. And give him the opportunity to chase.
In others words, be attainable but tenderhearted and feminine.