Monosexuals only: $1 million to marry someone of the "wrong" sex for a year
This is not open to people for whom there is not a "wrong" sex/gender of partner. Straight or gay is fine, bi or pan is not, unless you are also extremely asexual.
If you presently have a partner, it is preferable that you either assume they are out of the picture for whatever reason, or that they are OK with this.
the usual Eccentric Billionaire is running a social experiment. He has found for you an "ideal" partner (more or less) in all respects except that, if you prefer men, your chosen partner is a woman, or vice versa. That is, they are of whatever physical type you would find most attractive in a member of that sex, they have a compatible personality and values and so forth, and they find you very attractive. And, yes, they know you aren't "into" men/women (as relevant). (if the partner in question is trans, they have had all relevant transition surgeries, and can "pass" adequately well, so no "well, I'd want a trans man/woman with their original equipment intact" You are getting a dude who is in every reasonable respect male, or a lady who is in every reasonable respect female)
In order to get the $1 million, you need to:
Marry your selected partner, and stay married for a full year
Consummate the marriage, and have marital relations with them at least once a month thereafter (which must include at least some activities that most people would recognize as sex, not just kissing or whatever)
Share a house and bed with them for the duration of your marriage (if you travel for work, they will travel with you)
Remain faithful to them for the duration of the marriage (that is, no sexyfuntimes with anyone besides your spouse, other than solo activities)
Anything beyond that is between you and your new spouse.
If you presently do not have a large enough house/apartment to share it with someone else, appropriate accommodations will be provided for the year at the same price you are presently paying. Your living expenses and household workload will not be higher than they presently are, and may be lower (that is, your partner will pull their weight, both financially and in terms of household tasks)
Do you accept? Why or why not? Any other thoughts?