Right.. Boobies.
I'm not up to date on Brighton's strip clubs but the two I wander past in town most frequently are Platinum Lace
http://www.platinumlace.co.uk/strip-club-brighton and Grace
http://www.graceofbrighton.com/ I think Platinum Lace is the upmarket one but is pricey by all accounts. I don't know anyone who's ventured into Grace so I can't comment. Apparently you can get the stag up on stage with two women for £70.
Pubs
Right.. I'm taking your description of relaxed nice boozers literally so this is a list of decent places to go for a pint in Brighton. They'll all be busy on Friday / Saturday nights but they're not 'classic' stag do places (those will be found on West Street).
Station/North Laine
West Hill
http://www.thewesthill.co.uk/Mex's pub. He'll be fucked off if you don't show your face at least once. It's just up the road from the station and it's open till 3am with DJs on Friday and Saturday nights (I think!).
Evening Star
http://www.darkstarpubs.co.uk/Has it's own micro brewery. Massive selection of beers / ales. Tiny though.
Prince Albert
http://www.facebook.com/ThePrinceAlbertOn Trafalgar Street, just down the hill from the station. Popular music pub, lots of gigs.
The Basket Makers / The Eagle / The Fountain Head
http://basket-makers-brighton.co.uk/http://www.beerintheevening.com/pubs/s/64/6475/Eagle/Brightonhttp://www.drinkinbrighton.co.uk/fountain-head3 Decent pubs within 100m of each other. Very popular places. The Basket Makers in particular is nicely old School. The Eagle and the Basket Makers do good food. The Brewery Tap (
http://www.mybrewerytap.com/bars/brighton.html) is new but already has a good reputation.
The Waggon and Horses and Mash tun are also nearby and are very popular. Big outside areas, bit of a festival atmosphere on a warm evening.
Central Brighton
Northern Lights
http://www.northernlightsbrighton.co.uk/Cool little Scandinavian pub tucked away. Sometimes busy, sometimes not. Good selection of quirky Scandinavian drinks you've never heard of..
Cricketers
http://www.goldenliongroup.co.uk/bars-and-pubs/cricketersOld School pub.
Fiddler's Elbow
http://www.beerintheevening.com/pubs/s/33/3356/Fiddlers_Elbow/BrightonProper Irish Pub.
The Bath Arms
http://www.shepherdneame.co.uk/pubs/brighton/bath-armsVery Central. Decent Boozer. Decent Food.
St James Street
This is my neck of the woods. It's a 5 min walk from town but there are endless B&Bs in the area so you'll always see stag and hen dos in the area.
Black Dove
http://blackdovebrighton.com/Riding on the retro 30s/40s/50s wave. Not everyone's cup of tea.. but fun and friendly and a good selection of drinks.
Brighton Rocks
http://www.brightonrocksbar.co.uk/Small and a bit trendy but can be a nice venue.
The St James
http://www.beerintheevening.com/pubs/s/20/2098/St_James_Tavern/BrightonOne of my favourites. Busy and not much seating. Good music and over 80 types of rum available.
The three and ten
Just down the road from the St James. Worth a stop if you're passing by.
Other random pubs of note (in no particular order) are: The Black Lion, The Hop Poles, The Seven Stars, The Fortune of War.
I'll leave the pubs there because if we're on the wrong wavelength then it'll have all been in vain! I'm sure Mex will slate me too!
Clubs are a little bit more tricky with a large group of men so I'll leave that to someone else! The same goes for bars as they're just not my thing.