re bodybuilding and rugby. in all reality, my man, if you really want to excel in rugby, you will have to forsake certain elements and results of your bodybuilding. reasons?
i) the aerobic component of rugby means that you will have to do much more running, even if it is only short sprints, than you would do as a bodybuilder. this will compromise your energy reserves and tax your anaerobic system - in season, that means that you will probably get a little weaker in the gym.
ii) no serious rugby player i know does nine different exercises for one body part (like calves), as do bodybuilders. many of those exercises are meant for hypertrophy mainly, and in rugby if it ain't useful weight, meaning working towards your power and speed into contact, you don't want it. most bodybuilders are very large, yes, but not as strong as athletes or powerlifters in terms of power:weight ratios.
iii) whereas the exercises which DO contribute to your power and speed are mainly core exercises and full body exercises, i.e. squats, deadlifts, power cleans, snatches, hang cleans, clean pulls, and plyometrics. even for the core lifts, the reps are usually no higher than 6 or so (save for warmups) in order to increase strength and neuromuscular response. bodybuilding works in ranges mainly for hypertrophy of 8 - 12 reps. this will affect the sorts of "pumps" you get in the gym, and will eventually affect the look of the muscle, turning it from that round, almost inflated look of a bodybuilder into a much more skeletal and practical muscle of an athlete.
iv) those exercises also stress the core strength area, namely the waist, and will thicken it up considerably. where you once had a v-taper, you will now be a little more "blocky" as a result of increase abdominal and lumbar strength and mass.
v) consider also the injury probability - everyone i know who plays anything like serious rugby gets injured for a time during a season, and that will keep you out of the gym, especially if your priority is on the pitch. that too will affect the sheer size of your muscles.
all that said, though, i wouldn't worry too much about the loss of too much muscle mass. look at lomu, jason robinson, the south african front rows, etc. they are big, yes, but none of them would qualify for a serious bodybuilding competition. they could however smack the living shit out of any bodybuilder with a dumptackle and get around just about any Olympia competitor with relative ease. what muscle you see on a rugby player is there because he or she USES it, not because it comes from an exercise out of FLEX magazine.
hope this helps - i'd say go for the rugby, but then you have to make up your own mind. i also think from my own experience that women prefer the athletic look to the pumped up bodybuilder look - but then few men are actually bodybuilding just for women, as opposed to trying to look intimidating to other men.
my two cents worth.
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