Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You are a man aged 36 years, married for 10 years, no child, your wife's
HSG was allright, your
sperm count is 188 million, 98% was normal, Your sperm is too light and colourless.
The colour and specific gravity has nothing to do with the
fertility, when other parametres are good.
Your wife's HSG was good, but other investigations for P.C.O.S. and other things are to be tested by transveginal USscaning.
I advise you to follow male above posture of sex , ask your wife to stay in position for at least 5minutes after sex.
Both of you have balanced diet with excess of green leafy vegetables, pulses, sprouts, and proteine foods.
Wishing for a quick and favourable result.
best regards.