Please take a note those mechanics can be ignored if you don’t think those will be necessary (for ex. In a casual sex). Those are created primarily for encounters with creatures like tentacles, hog orcs and high elf THOTs.

Venom’s version:

Sexual actions damage partner’s RES, once it reaches 0, the player must roll for a Mind Break effect. If a character ends with equally 0 RES, they roll for a soft mind break; if it’s -5, then they roll for mid mind break; if they end up with -10 or more RES, they roll for hard mind break. 

RES equals SPR x10 and represents the character's resistance to sexual influences and actions. At the end of each turn both characters lose -5 RES points and commit an Orgasm test by rolling X d10 where X is their SPR. If the total sum is equal or lower to their current RES score, they succeed and avoid cumming. However if the total score is higher than the current RES score, they get an orgasm and instantly lose -15 RES. At this point it is up to the character do they want to end the intercourse. 

Both characters might commit sexual actions against their partners before and during sex by making a RES test or defend themselves by making SPR test. Those actions can be anything sex related like licking, kissing, biting, talking dirty ets. Additionally characters might do other actions by committing a proper test (for example trying to escape by doing a STR test). If the character succeeds, their RES will be added to the next Orgasm test of their partner; if they fail any non-defensive test, they lose flat -5 RES. 

A horny High Elf Mageblade (CHR 7, SPR 5, RES 50) captured an Orc Greenskin Shaman (CHR 3, SPR 5, RES 50). The orc woke up naked and bonded to the bed. Before the act could happen Elf decided to warm up her partner by giving him an oral. They both make a 1d20 test: Elf rolls 14 and Orc 3. With SPR of 5 the orc was successful and resisted Elfs dastardly tactics. 

Next round the Elf decides to get on top of the captured Orc and starts to ride him, we now enter the sex round. Elf used her action to get on the Orc, so he has an action left. Orc tries to break his bonds, he has STR 8 but rolls 12, he has failed and so loses -5 RES. 

Round 1 of sex ends, both characters loses -5 RES, leaving them with Elf: 45 RES and Orc: 30 RES. Now both roll for Orgasn, both have 5 SPR so each uses 5 d10s. Elf rolls 14 and orc 22, they both succeed this round. 

Round 2 starts - Elf decides to lick Orcs nipples, making a CHR test, and Orc defends with a SPR test. Elf: 4 Orc: 18. Elf succeeded so her CHR will be added to Orc’s next orgasm test result. The round ends, both suffer -5 RES, so Elf: 40, Orc: 25. Both roll for Orgasm, Elf scores 24, succeeding, Orc suffers the +7 penalty so his end score is 33+7=40, which means he cums, receiving additional -15 RES damage. His end RES is now 10. 
Since the Elf just was filled with Orc cum, she can decide to end the encounter. However if she chooses not to, she can keep riding the Orc, while his RES will eventually reach 0 and his mind breaks. Once that happens, the Orc will roll a proper Mind Break effect. For example if he ends with an equal 0, he will roll a soft MB, like “lose consciousness”. 

Robotic version:

Sexual actions damage partner’s RES, once it reaches 0, the player must roll for a Mind Break effect. If a character ends with equally 0 RES, they roll for a mind break. 

RES equals SPR x10 and represents the character's resistance to sexual influences and actions. While teasing only damage RES when “attacker” roll higher CHR roll than “defender” SPR roll, sex will damage RES by -5 every turn. First person who get their RES count to 0 orgasm and need to throw D66 for mind break effect. If a person is still in intercourse with RES 0 it’s treated like unconscious until intercourse is over.

In the intercourse characters throw XD10 two times where X is their SPR and CHR, where CHR is taken from the enemy and SPR from itself. If CHR throw is bigger than SPR throw then the difference is subtract from RES. If SPR throw is bigger than CHR throw no additional RES is substrate

Male Orc (7 SPR, 3 CHR, 70 RES) travelling through forest was ambushed by female elf THOT (4 SPR, 8 CHR, 40 RES). She tried to lewd him, taking her clothes of and shake her booty. Orc rolled 54 on SPR check (7d10) and elf rolled only 41 on her CHR check (8d10). Orc, amused, showed her his girth and thrush the air, showing he is a big boy. He rolled 25 on his CHR check. Meanwhile elf blushed and is a little intimidated. She rolled only 17 on her SPR check, leaving her with 32 RES 17-25=8 40-8=32). Next turn they start having sex.

On the first turn they both don’t do anything special, so both rolls clean SPR and CHR checks. Orc threw 42 SPR and 8 CHR, Elf meanwhile threw 21 SPR and 62 CHR. Orc lose 25 RES (20 from throws and 5 from first turn). Elf, thanks to high SPR throw lose only 5 RES. Now Orc got only 45 RES, while elf got 27 RES. 

Next turn elf still does nothing, but Orc used his skill “Mighty thrush”, which add 2 dice to his CHR roll. Orc threw 56 SPR and 36 CHR, Elf meanwhile threw 13 SPR and 60 CHR. That mean Orc have 36 RES and Elf 4 RES. 

In the last turn Elf tries to punch Orc and interrupt their intercourse, but she failed her STR check. No matter of the next throw she would get orgasm and will need to throw d66 from orgasm table. Now Orc will need to choose if he wanna continue intercourse or just stop. If he wanna continue Elf is treated like she is in unconscious to the moment she is rescued or left alone.