I go as slow as the relationship allows. That said, notice the wording. It goes as slow as it needs to. I tend to have fireballs of love. Its generally how I work and considering my record in relationships, going slow is really a personal thing.
If you are comfortable running - jesus run.
I never try to dictate the pace directly, just try and move comfortably within everyones limits.
Keep in mind, your partners may be lying about their comfort. I figured this out when everything was going "well" but then find out they were using the stiff upper lip tactic
Either way, enjoy the ride and best of luck with your relationship