Sultry Sauna Night

In the spirit of German sauna culture and your partner's energetic disposition, you'll turn your bathroom into a personal sauna. Begin the evening with some at-home sports trivia games, since your partner loves to talk about sports. Then proceed to the 'sauna'. To enhance the authenticity, prepare eucalyptus infused steam. Spend the rest of the evening unwinding in your homemade sauna, sharing stories and discussing sports.
As the temperature in the room rises, so does the intimacy. Let the evening take a natural course, leading to deep conversations or perhaps, a slightly more sensual atmosphere. Remember always to respect your partner's boundaries and ensure mutual comfort. This experience's beauty is the adaptability to either a cozy night with comforting conversation or something more exciting.
Afterwards, cool down with some iced teas or refreshments of your choice. Have a cozy cuddle session, exchanging thoughts and discussing the highlights of your intimate sauna night.

You'll first need to prepare your own personal sauna. You can do that by heating your bathroom enough to generate steam, perhaps by running hot water in the shower or filling up a bathtub with hot water. While things are heating up, create an ambient atmosphere using dim lights and scented candles. Consider using eucalyptus or lavender scent to replicate a real sauna experience.
Since the theme's main focus is on having a sauna together, ensure you both have suitable attire. Your partner, being French, might appreciate something sexy yet sophisticated. A nice, fluffy, white robe with your best bath slippers should serve you well.
Finally, set up a small comfortable spot where you both can chill with drinks and snacks after your sauna session. Make sure to refresh and hydrate yourself well! Have some cool towels handy as well. You can proceed with your sports trivia session once things start warming up.

Ensure that your bathroom's temperature and moisture level is safe and comfortable for both of you. Too much heat or steam isn't healthy and can be potentially dangerous.
Have some conversation starters ready in case you run out of sports topics to discuss. This would ensure that no awkward silences creep in and you have a fun, smooth-sailing evening.
Lastly, keep your partner's preferences in mind. Since she is energetic and sporty, she might appreciate games or more lively discussion during the sauna experience. This sauna night should be a blend of both cosy and energetic.