I do bikram all the time, I have the lads who weight train doing it too & my boxing coach. It's therapeutic. Fantastic for flexibility & mobility especially. The warm humid air softens tissue & warms the muscle as you work through the poses. It is definitely intense as the poses focus on strength, balance, coordination, engaging & contracting your muscles for the duration of the poses. It makes you very aware of your body, the contraction, the positive movement, the negative movement, the attainment of flexibility, your capacity for mobility. Your strength, stamina & physical capacity for endurance.
Its invigorating & one of the best ways you can soothe your body and keep it pliable & loose before, during & after a workout.
Its fun for me to see these big strong muscular lads, struggle to make & hold the poses. It becomes very competitive for them. And where once they thought it was a dumb 'chick thing' - they soon realise how much physical strength you need to be able to complete the session.
As well as giving you a complete sense of wellbeing.
I've done bikram 4-5 times a week for two years. I started at 160.2kg & there was no chance in hell I could do any of the poses with anywhere near passable form. Now at 69kgs, its all about muscle contraction, balance, posture, personal strength. I know my body & every muscle in it & I'm strong
I would recommend bikram, any day of the week. Any form of Hatha yoga is therapeutic for the body.
Any drop in weight is water weight & the body is easily replenished afterwards. Do the high temps create stress for the body? Of course. So does weight training, boxing & cardio. Stress your body, push it, to achieve change. Simple as that.
Like anything, pregnant woman can't do it, those with pulmonary disease can't do it, if you're anemic you can't do it & if your prone to fainting, you can't do it. But then people with any of those conditions can't put any kind of physical stress on the body, or exert themselves in any way.
Try it? You'll love it

Its a challenge!