What are some fun/kinky things to do with your partner?

Mutual masturbation

Take a sensual shower together. Rub your soapy body all over theirs.

Sex on a hard floor or rug rather than a soft bed

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Snowball - cum inside her vagina, go down on her and suck it out, and then kiss her and shove your own spunk in her mouth.

Sex in public

Titty fuck

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Short (5 minutes or less) quickies

Long (hour or more) marathons

Food play (sploshing) - including washing her off in the kitchen sink.

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Sex in a pool

Couples massage at a spa

Induce squirting with the right techniques.

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Meet other couples through a Lifestyle website.

Open her up with a speculum and see what's inside. Give her a mirror or take pictures for her.

Try different sex positions - Read and go through the Kama Sutra.

Why should the law care about what I do behind closed doors?

Sex with other couples (or at least near them)

Canibalism - eat a tiny piece of each other - typically a nip of you ass cheek. This may leave a small permanent mark, but it was in love.

Bite hard on a tough part of you partner's body, like their heel without breaking the skin. Endorphin rush

What's a memory from your childhood that shaped who you are today?

Sex club - watch, be watched or fully participate

Play sexy truth or dare card games.

Temporary body paint

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Sex on the beach

Forced hydration. Drink water during sex until you lose bladder control.

A sexy walk in the park at night, when nobody else is around

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Anal play

Sex with good friends but not lovers. Keeping the balance is tricky.

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Hair play. (Cowgirl, brushing her long hair over his skin and face)

Mutual massage which may or may not get erotic

Find porn or erotica that you both like.

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Fall asleep spooned up, coupled. Can you stay that way when you wake up?

Golden enema

New lingerie

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Prostate massage.

Scented massage oils

Outdoor sex under the real stars

Pregnancy play. Ask a woman who's stopped menstruating but wishes she could have more kids whether she wants a boy or a girl just before cumming inside her.

Nude co-ed sauna. (Russian banya)

Mood lighting. Try a sega Homestar planetarium projector

Candle wax play

Here is another list

Sex swing

Sex on the dining room table

Butt slapping as hard as they can take and enjoy.

Long distance hot video chat with mutual masturbation.

TENS unit - electro shock

Take a sexy shower together. Soap makes pretty good anal lube and clean up is easy.

Hot tubs

Write your own sexy truth or dare card games.

Golden shower

“Rescue” sex - partner lets go and is about to do something dangerous but hold them back at the last second. This takes trust.