You want to be supportive? Then don't bribe him with sex if he wins... or BETTER sex if he wins. Your love, and your sex with him shouldn't change regaurdless of win-loss stats... so why involve yourself? You have nothing to do with whats going on in the ring there, so offering yourself up as a prize for a win (or a lack of a prize for a loss) is artificially inserting yourself into a situation that has NOTHING to do with you, or your relationship with this man.
Are you a HUGE boxing fan? Are you dating him to live out some boxing movie fantasy where he is the hero? If not, if you are more grounded in reality than that... then you should support him at boxing, like you'd support him at ANY job.... by being there with a hug and kiss when he's let down... being proud of his efforts, encouraging him about next time -- and to cheer his success'. Same as anything else.
Lots of women date pro athletes and deal with the ego's and sensitivities of wins and losses but remain a safe haven away from all that stuff. If you thrust yourself into that world like you are his trainer -- deciding when to give him goodies based on his fights and wins -- then you will no longer be that supportive gf, you will just be part of his job.
Let him decide whats best for his performance as far as sex before the fight. Most fighters probably wouldnt want to orgasm before going into the ring... feeling all relaxed and lazy -- they'd want to be pumped up and energetic.
Take a look at the typical man before sex, then after... dozing on to their pillow

Common sense would say... he shouldn't pop off before a fight. But all boxers, fighters, trainers have ideas about all this and figure out what works for them, talk to him about what he wants... if he wants a back rub the night before a fight... or for you to please him and de-stress him. He will know whether or not he'd rather be amped on testosterone or mellowed out.
If he was not a fighter and worked at an office -- you wouldn't thrust yourself into the situation. You wouldn't say 'bob... if you don't meet your deadline this friday on the johnson account i am not having sex with you'. Or 'bob... if you get recognized in today's meeting I am going to rock your socks off tonight!!'. You just wouldn't. His fighting is a job like any other.
If he wants you to go, show up. Don't be screaming at him like one of those crazy parents at a little league game... don't hide in the background, just attend, cheer for him like everyone else... and be in the wings to kiss him and hug him when its all said and done. If you don't want to see him engaged in a fight... let him know you will attend but that you want to wait in the locker room for him.
I suspect though, like CW... that perhaps none of this is real. Its just a set up. Like the last post. Where he loses and you lose interest in him because of it and blah blah blah.
But if any of this is actually applying to your real life -- realize life isn't a rocky movie, you don't have to equate his manhood with how well he does in the ring. You don't have to supperimpose yourself into some crazy fantasy where what you do or don't do is making the difference in how well he performs. If you love him, just support him by staying out of it as far as rewards and prizes go. Root for him to succeed, remind him of his efforts when he falls, and show him that what you feel for him remains unchanged... whether he wins or loses.
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