I don't know why, but throught a lot of the song I cannot understand what in the hell he's saying .

I got most but not all. At the risk of embarrassing myself, I'm going to share what I transcribed so others can weigh in and hopefully figure out the lines I could not make out, and confirm the text I have down. Question mark in brackets have been placed at the ends of lines where I don't think I got down all the right words. Underlined blank spaces are lyrics I just could not figure out at all. (Also, thanks to Vainandy and Kcoolmusiq for past contributions that helped me get what I think are the correct lyrics for the line about the guy's woman stepping out.)

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"Book of Love"

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Ooo, do-do, do-do, oh oh ooh

Ooo, do-do, do-do, oh oh ooh

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____________all the questions_______ leave it and more [?]

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Once a girl said to me, baby I don’t understand (oh no)

You see I wanna fall in love but I can’t find the perfect man

Still I try and I try but it always seems to turn out wrong

Seems like every situation love didn’t last too long

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(ooh) Listen, cuz the answer to the question is written in the book of love

Of love

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Once a friend came to me and asked me if I knew the way

He said his woman stepped out and really thinks she's turning gay

So I took him by his hand and I looked him right in the eyes

I said falling in love with a man ain’t no surprise

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Oo wee baby, but the answer to the question is written in the book of love

____________________________[?]

Of love

Do more [?]

Of love

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Once there was a girl, fell totally in love

She’s never innocent when it come to making love (Oh no)

There were so many things that I could not tell her

I loved another girl so she loved another fella

On and on we two made love together [?]

Loves all good until it’s the very last on Earth [?]

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Ohhh, Written in the book of love (yeah)

Oooh written in the book of love

Break it down right, I wanna [?]

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French girls, I’m saying it’s all right, say it (ooh, oh oh oh)

French girls, I’m saying it’s all right, say it (ooh, oh oh oh)

Everybody in the world say it

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[Edited 2/9/16 15:43pm]

^^good job...those seem to be the correct lyrics