It's all very well saying it's selfish to marry and I'm genuinely sorry for the people who've gone through having a spouse come out as gay, but I can't imagine many people do it just for laughs.
I doubt you have any idea how horrific it is to be married to someone who doesn't feel in any way sexually attracted to you. I doubt you have any clue how that affects your self esteem as a woman (and most likely as a man too).
Hint - think of your worst nightmare. Multiply it by 100.
Nobody owes a gay person anything. Yes, it is hard to be gay. Yes, a gay person would like a family. But everybody, straight or gay, has the responsibility to live with integrity. Nobody has the right to foreclose someone else's options and set them on a path that has lifelong repercussions just because you have dreams. Everybody has dreams. Not included in the vast majority of people's dreams is the prospect of living with someone who doesn't actually desire your body. Don't ask someone to sacrifice their happiness for yours.
Everybody owes any potential children they might have the prospect of the best possible life they can give them. You are deluding yourself and being massively selfish to think that marriage to a straight man would be happy for either of you, and that any children you had would not be affected by that.
You are deluding yourself if you think marriage to a straight man would have any more than a slim chance of avoiding divorce as a result of that unhappiness.
The effect on children of all that is horrendous.
My DCs lost their lovely home and garden, their friendly neighbourhood, their unitary family, their childhoods, essentially. They had to spend every second weekend away from home, packing clothes and shoes and homework and school sports gear and tampons and iPads as if they were heading for a weekend out of town. They had to spend half of every Christmas holiday with exH, sometimes leaving on Boxing Day for the eight remaining days of the holiday. My youngest DD remembers no other way of living.
Speaking very personally here, I still feel immense anger that my exH even considered bringing children into the world, knowing what he did about himself. I mean, what chance did he really think our relationship had? He took me and my dreams completely for granted. I was a one dimensional being as far as he was concerned. I was merely the facilitator of everything he needed to live a 'normal' life. It came as an enormous shock to him that I was miserable. He simply hadn't factored me into his neat equation at all.